Relevant bibliographies by topics / Dairy cattle reproduction

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  2. Dissertations / Theses
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  5. Conference papers

Academic literature on the topic 'Dairy cattle reproduction'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Dairy cattle reproduction"

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Popov, N. A., Yu A. Ivanov, V. K. Skorkin, and V. Yu Sidorova. "Innovative technologies of dairy cattle reproduction." Glavnyj zootehnik (Head of Animal Breeding), no. 6 (June 1, 2021): 20–29. http://dx.doi.org/10.33920/sel-03-2106-03.

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The American company for the reproduction of dairy cattle – World Wide Sires was formed in 1976 in the United States, and its subsidiary World Wide Sires Russia – in 2006 in the Russian Federation. Over the past decades the average milk yield of cows has been increased significantly, but their fertility has been decreased. A comparison of the DNA of cows producing about 20,000 kg of milk and more than 1,000 kg of milk fat per lactation has shown a genetic association between the milk yield of cows and the fertility of breeding sires. Therefore, one of the directions of the company’s development is the development of innovative technologies for improving reproduction with the genetic improvement of breeding traits of breeding sires. Improving the fertility of Holstein sires and their high-quality semen are the main conditions for solving problems related to the reproductive function of animals. Application of index selection programs, including OptiFeed (optimal feeding), Production-max (best production), Fertility (high reproduction capacity), etc. are powerful lever of herd management. All available genetic indexes are directly or indirectly included in the general index of breeding value of the sire – TPI. One of the methods of refining the index system is the use of ultrasexed semen with 4 million sperm cells in a dose, which increases fertilization in heifers and cows by 5 and 6 %, respectively. Another method of refi ning the index system was the definition of inbreeding. For example, an increase in inbreeding by 1 % led to a decrease in the dollar profit index NM$ by 24 points, added 36 undesirable days to the age of the first calving, reduced productive life by 13 days, reduced milk yield by an average of 358 kg of milk and 11,3 kg of milk protein per lactation. The cost of each additional day of the open days’ period after the start of the hunt ranged from 220 to 370 rubles loss per 1 cow per year.
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Rasad, Siti Darodjah. "Evaluasi Penampilan Reproduksi Sapi Perah (Studi Kasus Di Perusahaan Peternakan Sapi Perah KUD Sinarjaya)." Jurnal Agripet 9, no. 1 (April 1, 2009): 43–49. http://dx.doi.org/10.17969/agripet.v9i1.621.

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Evaluation performance reproduction on dairy cattle (Case study in sinarjaya dairy cattle cooperationABSTRACT. Aim of the identification of performance reproduction was to find out the successfully of reproduction management in the dairy cattle firm or farmers. Performance reproduction of dairy cattle include days open, calving interval, service per conception, first service postpartum and length of the pregnancy. All of that performance reproduction values was ideal value and close relation to the production and that values was difference between farmer and depend of management themselves. Sinar Jaya cooperation is one of dairy cattle cooperation, since 1977 with the population about 1554 dairy cattle’s in year 2006, has been opportunity to find out the performance reproduction of dairy cattle in that cooperation. Dairy cattle about 197 cattle’s was used as a sample of the treatment, which were minimum two times calving period with the completely recording of reproduction activity. The method of this research was descriptive method and the data was collected as a census method. As a conclusion, reproduction performance for the first service postpartum, days open and calving interval were ideal values but service per conception was bigger than optimal value.
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MCDOUGALL, Scott. "Reproduction Performance and Management of Dairy Cattle." Journal of Reproduction and Development 52, no. 1 (2006): 185–94. http://dx.doi.org/10.1262/jrd.17091.

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СЕМЕНОВ, В. Г., С. Г. КОНДРУЧИНА, А. Н. МАЙКОТОВ, С. Л. ТОЛСТОВА, and Т. Н. ИВАНОВА. "SYSTEM OF DIRECTED REPRODUCTION OF DAIRY CATTLE." VESTNIK RIAZANSKOGO GOSUDARSTVENNOGO AGROTEHNOLOGICHESKOGO UNIVERSITETA IM P A KOSTYCHEVA, no. 4(48) (December 29, 2020): 69–76. http://dx.doi.org/10.36508/rsatu.2020.48.4.010.

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Цель работы – изучить влияние направленного воспроизводства коров на формирование высокопродуктивных здоровых стад. Методология. Научно-исследовательская работа проведена в базовых хозяйствах Республики Казахстан: СПК «ПЗ Алматы», ИП «Сыдыков», ИП «Каримов», ТОО «Тастобе АгроФуд» Алматинской, ТОО «Какпатас-Кордай» Жамбылской, ТОО «Борте милка» Туркестанской и КХ «Зайтенов» Восточно-Казахстанской областей. Для искусственного осеменения выбирали телок 12-14-месячного возраста живой массой от 360 кг и коров-первотелок голштинской, симментальской, швицкой и черно-пестрой пород. Осеменение проводили ректоцервикальным методом с помощью инструмента Alpha Vision заморожено-оттаянным семенем, разделенным по полу. Результаты. Для ускоренного ремонта стада и увеличения поголовья высокопродуктивных коров в крупных хозяйствах по производству молока используют сексированное семя при первом и втором осеменении первотелок, полученных от высокопродуктивных матерей. Согласно научным данным, эффективность, получаемая от использования данной методики, составляет 65-95 % особей желательного пола. Наиболее высокие результаты плодотворности осеменения сексированным семенем в СПК «ПЗ Алматы», ИП «Каримов» и КХ «Какпатас Кордай» получены в осенне-зимний период и составили от 58,1 до 65,2 %, при индексе осеменения 1,58-1,72. При использовании сексированного семени от первотелок в среднем получено 92 % телок. При сравнительном анализе результатов по всем хозяйствам наиболее высокие показатели плодотворности осеменения отмечены у телок при естественной половой охоте. На фоне гормональной стимуляции половой охоты наблюдается снижение плодотворности осеменения в среднем на 4,72 %. При диспансеризации коров и телок выявлено 202 головы с нарушением воспроизводительных функций, из них вылечено 176 голов (87,13 %), с эндометритом – 81,25 %, с фолликулярной кистой – 86,79 %, с гипофункцией яичников – 91,76 %. Заключение. Научно обосновано и экспериментально доказано влияние направленного воспроизводства коров на формирование высокопродуктивных здоровых стад в базовых хозяйствах Республики Казахстан. Problem and purpose. The purpose of the work was to study the efect of directed reproduction of cows on formation of highly productive healthy herds. Methodology. The research was carried out at the basic farms of the Republic of Kazakhstan: APC “PZ Almaty”, PE “Sydykov”, PE “Karimov”, LLP “Tastobe AgroFood” in Almaty region, LLP “Kakpatas-Kordai” in Zhambyl region, LLP “Borte Milka” in Turkestan region and CF "Zaitenov" in Eastern-Kazakhstan region. For artifcial insemination, a calf of 12-14 months of age was chosen with a living mass of 360 kg and frst-born cows of Holstein, Simmental, Schwitz and black and white breeds. Insemination was performed by recto-cervical method using Alpha Vision tool with frozen-thawed semen divided by sex. Results. For accelerated repair of herd and increase of number of highly productive cows at large dairy farms one uses sexed semen for the frst and the second insemination of fresh cows got from highly productive mothers. According to scientifc data, the efciency obtained from using this technique is 65-95 % of individuals are of the desired sex. The highest results of the fruitfulness of insemination by sexed semen were obtained at APC “PZ Almaty”, PE “Karimov” and LLP “Kakpatas-Kordai” in the autumn-winter period and ranged from 58.1 to 65.2 %, with an insemination index of 1.58-1.72. When using sexed semen from fresh cows, about 92 % of heifers were obtained. With a comparative analysis of the results for all farms, the highest indicators of the fruitfulness of insemination were noted in calves during natural estrus. Against the background of hormonal stimulation of estrus, there was a decrease in the fruitfulness of insemination by an average of 4.72 %. During the medical examination of cows and heifers, 202 heads with impaired reproductive functions were detected, of which 176 heads (87.13 %) were cured, with endometritis - 81.25 %, with follicular cyst - 86.79 %, with ovarian hypofunction - 91.76 %. Conclusion. The infuence of directed reproduction of cows on formation of highly productive healthy herdswas scientifcally and experimentally proved at basic farms of the Republic of Kazakhstan.
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Moore, K., and W. W. Thatcher. "Major Advances Associated with Reproduction in Dairy Cattle." Journal of Dairy Science 89, no. 4 (April 2006): 1254–66. http://dx.doi.org/10.3168/jds.s0022-0302(06)72194-4.

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Cornou, C., S. Østergaard, M. L. Ancker, J. Nielsen, and A. R. Kristensen. "Dynamic monitoring of reproduction records for dairy cattle." Computers and Electronics in Agriculture 109 (November 2014): 191–94. http://dx.doi.org/10.1016/j.compag.2014.09.017.

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BATRA, T. R., A. J. LEE, and A. J. McALLISTER. "RELATIONSHIPS OF REPRODUCTION TRAITS, BODY WEIGHT AND MILK YIELD IN DAIRY CATTLE." Canadian Journal of Animal Science 66, no. 1 (March 1, 1986): 53–65. http://dx.doi.org/10.4141/cjas86-007.

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The relationships between reproduction traits, body weight and milk yield were investigated using data from 1611 heifers and 733 cows from two lines of the National Cooperative Dairy Cattle Breeding Project. The data were analyzed separately for heifers and cows within lines using a mixed linear model containing fixed effects for station, year of birth, season of birth and random effect of sires. Heritability estimates and genetic correlations were estimated by a paternal half-sib analysis. Heritability estimates for heifer and cow reproduction traits ranged between 0 and 26% while those of body weights at calving and 112 d postpartum and milk yield ranged from 24 to 43%. Heifers with difficult calving had a higher incidence of retained placenta than those with normal calving. Phenotypic correlations between heifer reproduction traits and milk yield during first lactation were small. High milk production in cows was associated with longer calving interval. Phenotypic correlations between heifer's and cow's reproduction traits were small. Difficult calving in heifers impairs reproductive performance after calving resulting in greater number of days from calving to first and last breeding and leading to a longer calving interval. Key words: Reproduction traits, heifers, cows, milk yield, dairy cattle
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Lucy, M. C., and B. A. Crooker. "Physiological and genetic differences between low and high index dairy cows." BSAP Occasional Publication 26, no. 1 (2001): 223–36. http://dx.doi.org/10.1017/s0263967x0003370x.

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AbstractSelection of dairy cattle for increased milk production has decreased some indices of reproductive efficiency. For example, days open are increased by one day for every 100 kg of increased milk yield per lactation. Some of the change in days open can be explained by delayed onset of oestrous cyclicity and lower conception rate to artificial insemination in cows with greater milk production. Despite these negative associations between milk production and reproduction, reproduction in herds of high producing dairy cattle is not necessarily compromised relative to reproduction in herds of low producing dairy cattle. This is because there is a large environmental effect on dairy reproduction. High producing herds generally have better management and better oestrous detection. Therefore, high producing dairy herds may partially overcome the antagonistic relationship between milk production and reproduction. Physiological mechanisms that lead to poorer reproduction in high producing cows are partially defined. Negative energy balance that occurs in high producing dairy cows can be associated with a delay in the initiation of ovarian cycles and the interval to first breeding. Many of the effects of negative energy balance on postpartum reproduction can be explained by decreased serum luteinizing hormone (LH) that is associated with negative energy balance. Serum LH increases as cows move toward positive energy balance and greater LH stimulates growth and ovulation of ovarian follicles. We have initiated studies to address physiological differences in high and low index dairy cows. The reproductive endocrinology of cows from a control line (5,900 kg milk/lactation) and a select line (10,900 kg milk/lactation) of dairy cows at the University of Minnesota was studied over a two-year period. Cows in Year 1 were similar for serum concentrations of LH, follicle stimulating hormone (FSH), and oestradiol (preovulatory period). In both years, serum concentrations of progesterone during luteal phases, however, were decreased in select cows. The Year 2 cows also had a delay in the return to oestrous cyclicity that was associated with reduced LH. The possibility that decreased progesterone causes infertility in dairy cows will require further study. Collectively, these data suggest that changes in blood progesterone concentrations may explain, partially, lower fertility in high index dairy cows.
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Capitan, A., P. Michot, A. Baur, R. Saintilan, C. Hozé, D. Valour, F. Guillaume, et al. "Genetic tools to improve reproduction traits in dairy cattle." Reproduction, Fertility and Development 27, no. 1 (2015): 14. http://dx.doi.org/10.1071/rd14379.

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Fertility is a major concern in the dairy cattle industry and has been the subject of numerous studies over the past 20 years. Surprisingly, most of these studies focused on rough female phenotypes and, despite their important role in reproductive success, male- and embryo-related traits have been poorly investigated. In recent years, the rapid and important evolution of technologies in genetic research has led to the development of genomic selection. The generalisation of this method in combination with the achievements of the AI industry have led to the constitution of large databases of genotyping and sequencing data, as well as refined phenotypes and pedigree records. These resources offer unprecedented opportunities in terms of fundamental and applied research. Here we present five such examples with a focus on reproduction-related traits: (1) detection of quantitative trait loci (QTL) for male fertility and semen quality traits; (2) detection of QTL for refined phenotypes associated with female fertility; (3) identification of recessive embryonic lethal mutations by depletion of homozygous haplotypes; (4) identification of recessive embryonic lethal mutations by mining whole-genome sequencing data; and (5) the contribution of high-density single nucleotide polymorphism chips, whole-genome sequencing and imputation to increasing the power of QTL detection methods and to the identification of causal variants.
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Heravi Moussavi, A., M. Danesh Mesgaran, and T. Vafa. "Effect of first 60-day cumulative milk yield on days open in Holstein dairy cows in Iran." Proceedings of the British Society of Animal Science 2007 (April 2007): 148. http://dx.doi.org/10.1017/s1752756200020512.

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Reproduction and milk production are the principal factors that are influencing dairy farm profitability. The dairy industry in Iran has changed dramatically in the last decade. The shift toward more productive cows and larger herds in Iran is associated with a decrease reproductive efficiency (Heravi Moussavi et al., 2004). Increased knowledge about the principal causes of reduced fertility is essential. The root cause of the declining fertility is probably a combination of a variety of physiological and management factors that have an additive effect on reproductive efficiency. Dairy cattle are inseminated and pregnancy is established while dairy cows are lactating. Based on the analyses of large datasets, there is clearly an antagonistic relationship between milk production and reproduction in dairy cattle (Lucy, 2001). It was shown that the hazard ratio for cumulative first 60-day milk yield and conception in high producer cows was 8 percent less than the others and also high milk yield was a risk factor for several reproductive disorders (Grohn and Rajala-Schultz, 2000). The objective of this study was to evaluate the effect of first 60-day cumulative milk yield on days open in Iranian Holstein dairy cows.
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Dissertations / Theses on the topic "Dairy cattle reproduction"

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Margerison, Jean K. "Restricted suckling and nutrition of dairy cattle." Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296323.

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Olynk, Nicole J. "Economic analyses of reproduction management strategies and technologies on U.S. dairy farms." Diss., Connect to online resource - MSU authorized users, 2008.

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Thesis (M.S.)--Michigan State University. Dept. of Agricultural, Food, and Resource Economics, 2008.
Title from PDF t.p. (viewed on July 28, 2009) Includes bibliographical references (p. 105-108). Also issued in print.
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Hamudikuwanda, Humphrey. "Endocrine and metabolic mediators of dietary energy status and reproduction in dairy cows." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28770.

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Five experiments were undertaken to identify metabolites and hormones that could mediate the effect of dietary energy status on reproduction, particularly pulsatile secretion of luteinizing hormone (LH) postpartum dairy cows.
In the first two experiments, the concentration of progesterone (P4) in tailhead adipose tissue and plasma in 12 cows at different stages of pregnancy and lactation was determined as was P4 produced in vitro by explants of tailhead adipose tissue. Concentration of P4 in adipose tissue was correlated with that of plasma P4 near estrus and during the luteal phase of the estrous cycle, and P4 was released in vitro by fat mobilization.
In the third and fourth experiments, blood was collected continuously for 16 h from four ovariectomized cows offered maintenance or restricted energy diets after priming with P4 or estradiol (E2) using a crossover experimental design. The results indicated that P4 released during body fat mobilization is minor and is not related to LH secretion. Dietary energy restriction influenced plasma LH concentration and pulse amplitude but the effect was modulated by P4 and E2 priming. Dietary energy restriction decreased glucose concentration but did not influence plasma non-esterified fatty acids (NEFA), cortisol, P4 and insulin levels. Cortisol was negatively related to LH pulse frequency. Glucose and insulin were positively and negatively correlated with LH pulse amplitude, respectively. Cortisol, NEFA and glucose jointly had a negative correlation with LH concentration.
In the fifth experiment, blood samples were collected daily for 60 d and every 10 min for 8 h on 18, 36 and 54 d postpartum from 24 cows (12 ovariectomized) fed low (1.4 Mcal/kg DM) (L) or high (1.7 Mcal/kg DM) (H) energy in a 2 x 2 factorial treatment design. LH pulse frequency was reduced at 18 d postpartum in ovariectomized cows, but not in intact cows, fed L. First postpartum ovulation occurred later in intact cows fed L compared to those fed H. Energy balance and plasma glucose concentration were lower, but plasma NEFA, $ beta$-hydroxybutyrate (BHB) and E2 concentrations higher, in cows fed L compared to those fed H. E2 concentration in intact cows fed L was elevated for a prolonged period prior to first ovulation. Diet had no influence on plasma P4 and insulin concentrations. Plasma E2 and BHB concentrations were positively correlated with LH pulse frequency in intact cows across diets and ovariectomized cows fed L, respectively. NEFA were negatively correlated with LH pulse amplitude in ovariectomized cows fed L. Glucose, NEFA and P4 were negatively, but BHB, E2 and insulin positively correlated, individually or in association, with LH concentration.
Overall, the results suggest that the effect of dietary energy status on LH patterns and timing of onset of postpartum ovulation is modulated by priming with or presence of ovarian steroids. The relationships of metabolites and hormones with LH patterns appear to change with dietary energy level, ovarian status and mutual associations among the metabolites and hormones. These parameters, especially glucose and BHB, may be potential mediators of the effect of dietary energy status on LH patterns. (Abstract shortened by UMI.)
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Larcombe, Michael Tinniswood. "The effects of manipulating reproduction on the productivity and profitability of dairy herds which graze pasture /." Connect to thesis, 1989. http://eprints.unimelb.edu.au/archive/00000650.

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Voelz, Benjamin. "Heat stress and uterine disease: Stressors influencing reproduction of dairy cattle." Diss., Kansas State University, 2017. http://hdl.handle.net/2097/36195.

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Doctor of Philosophy
Department of Animal Sciences and Industry
Luis G. Mendonca
Reproduction is an important part of a dairy operation that directly affects milk production and profitability. Fertility of high-producing dairy cows is less than desired. Reproductive efficiency is further impaired during summer months and after cows develop postpartum uterine disease. Heat stress and uterine disease act as stressors that negatively influence fertility of dairy cattle through a variety of mechanisms. This dissertation further investigates the negative effects of heat stress and uterine disease on reproduction, as well as examines two potential markers for predicting risk of developing uterine disease. Study 1 investigated the treatment of lactating dairy cows with gonadotropin-releasing hormone (GnRH) before first insemination during heat stress. Two experiments were performed to compare ovarian responses, pregnancy per artificial insemination (AI), and patterns of insemination of two estrus detection-based presynchronization protocols before first AI during summer heat stress. Treatment of cows with GnRH during summer heat stress altered ovarian response and pattern of insemination, however, did not improve pregnancy per AI. Study 2 evaluated ovarian response to treatment with GnRH and the odds of bearing a corpus luteum or being inseminated in cows with or without purulent vaginal discharge (PVD). Furthermore, hazard of insemination after administration of prostaglandin F2α was evaluated in dairy cows with or without PVD. Ovarian response was altered in cows with PVD compared with cows without PVD. Odds of bearing a corpus luteum or being inseminated was not associated with PVD in primiparous cows, whereas it was associated with PVD in multiparous cows. Hazard of insemination after prostaglandin F2α was not associated with PVD. Study 3 investigated arginase and matrix metalloproteinase-8 (MMP-8) as potential markers for metritis. Activity of arginase 7 days before parturition has been identified as a potential marker for the risk of developing metritis in dairy cows. In contrast, MMP-8 was not associated with the risk of developing metritis, therefore, MMP-8 is not a good candidate as a marker for metritis. Further research is warranted in the areas of reproductive physiology, heat stress, and uterine disease because several unanswered questions still exist. Improving fertility during times of heat stress and after the occurrence of postpartum uterine disease will improve milk production, animal welfare, and profitability of dairy farms across the world.
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Gallo, Guillermo Federico. "Effects of exogenous recombinant bovine somatotropin on reproduction and nutritional status of dairy cattle." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74303.

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Long-term administration of recombinant bovine somatotropin (rbST) significantly increased milk and 3.5% fat-corrected milk production without altering milk composition. These effects occurred regardless of breed, parity or drug delivery system (daily or sustained-release) utilized. Somatotropin did not affect apparent digestibility of rations, dry matter intake, crude protein intake, energy intake or energy balance. Body energy reserves, measured as body condition scores, decreased during rbST treatment resulting, together with the increase in milk yield, in an improvement of the efficiency of conversion of feed to milk for cows treated with rbST. Body condition was completely regained during the dry period. No effects of rbST on mastitis or metabolic diseases were observed. During lactation, injection of rbST produced elevated circulating concentrations of non-esterified fatty acids, glucose, insulin, bST and IGF-I but lipid composition of liver and ketogenic functions were not altered. These lipolytic and diabetogenic activities might contribute to the galactopoietic response elicited by rbST. Somatotropin did not modify the nutritional status of cows during pregnancy or the nutritional status and growth rate of their calves from birth to weaning.
With regard to reproduction, somatotropin augmented ovarian progesterone production during the first two estrous cycles post-injection and during gestation. These effects may have been mediated through increased ovarian IGF-I synthesis. Somatotropin enhanced the GnRH-induced LH response at 14 d postpartum. In spite of these positive observations, somatotropin treatment tended to produce longer calving to conception intervals. Nevertheless, the higher persistency of milk production by cows treated with rbST may compensate for this difference economically.
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Truman, Carissa Marie. "AUTOMATED BODY CONDITION SCORING: PROGRESSION ACROSS LACTATION AND ITS ASSOCIATION WITH DISEASE AND REPRODUCTION IN DAIRY CATTLE." UKnowledge, 2019. https://uknowledge.uky.edu/animalsci_etds/96.

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Body condition scoring is a technique used to noninvasively assess fat reserves. It provides an objective estimate to describe the current and past nutritional status of the dairy cow and has been associated with increased disease risk and breeding success. Traditionally body condition scores are taken manually by visual appraisal on a 1 to 5 scale, in one-quarter increments. However, recent studies have shown the potential of automating the body condition scoring of cows using images. The first objective was to estimate the likelihood of disease development and breeding success, using odds ratios, associated with body condition score scored automatically at various points in lactation. The second objective of our research was to use a commercially available automated body condition scoring camera system to monitor body condition across the lactation period to evaluate differences between stratified parameters and to develop an equation to predict the dynamics of the body condition score. We found that poor body condition score at different times during the transition period are associated with increased disease occurrence and lower reproductive success. Automated body condition scoring (ABCS) curve during lactation was influenced by many factors, such as parity, ABCS at time of calving, disease occurrence, and milk production.
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Lefebvre, Daniel Maurice. "Studies on the effects of recombinant bovine somatotropin on nutritional status and reproduction of dairy cows." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0003/NQ44488.pdf.

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Clempson, Andrew. "Associations of genetic polymorphisms with growth, fertility and production traits in UK dairy cattle." Thesis, Royal Veterinary College (University of London), 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558960.

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Halbach, Theodore John. "SEASON AND LACTATION NUMBER EFFECTS ON PRODUCTION AND REPRODUCTION OF DAIRY CATTLE IN ARIZONA (AGE)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275354.

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Books on the topic "Dairy cattle reproduction"

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Galvin, James A. Ovarian follicular development following oestrus syncronization programmes at different stages of the oestrous cycle in lactating dairy cows. Dublin: University College Dublin, 1995.

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Soderquist, Lennart. Sperm characteristics and fertility in dairy A.I. bulls: With special reference to sperm motility, ATP content, sperm morphology, and spermatogenesis. Uppsala: Sveriges Lantbruksuniversitet, 1991.

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Lane, V. Michael. Dairy herd reproductive troubleshooting: A problem-oriented approach. [Pullman]: Washington State University, 1989.

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Dairy Cows: Reproduction, Nutritional Management and Diseases. Nova Science Pub Inc, 2013.

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Moya, Joaquim. Sire of fetus effects and environmental correlations for dairy cattle production and reproduction. 1985.

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Saito, Hiroshi. Designing a genetic improvement program for the Indonesian dairy industry. 1993.

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Lucy, Matthew Christian. Effects of calcium salts of long-chain fatty acids, growth factors, and energy balance on ovarian follicular dynamics in postpartum dairy cows. 1990.

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Nyean, Lee Chin, ed. Using gonadotropin-releasing hormone (GnRH) to improve dairy cattle conception rates in the tropics. [Honolulu]: HITAHR, College of Tropical Agriculture and Human Resources, University of Hawaii, 1989.

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Forar, Alvin Leland. Descriptive epidemiology of abortion in ten northwestern U.S. Holstein dairy herds. 1993.

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Kinsel, Mark Leslie. Observational studies of the risk factors for abortion in dairies. 1993.

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Book chapters on the topic "Dairy cattle reproduction"

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Ambrose, Divakar J. "Postpartum Anestrus and its Management in Dairy Cattle." In Bovine Reproduction, 456–70. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118833971.ch52.

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Colloton, Jill D. "Applications of Ultrasonography in Dairy Cattle Reproductive Management." In Dairy Production Medicine, 99–116. Oxford, UK: Blackwell Publishing Ltd., 2011. http://dx.doi.org/10.1002/9780470960554.ch8.

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Risco, Carlos A., and Pedro Melendez Retamal. "Diseases that Affect the Reproductive Performance of Dairy Cattle." In Dairy Production Medicine, 123–31. Oxford, UK: Blackwell Publishing Ltd., 2011. http://dx.doi.org/10.1002/9780470960554.ch10.

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Shields, S. L., H. Woelders, M. Boer, C. Stötzel, S. Röeblitz, J. Plöntzke, and J. P. McNamara. "Integrating nutritional and reproductive models to improve reproductive efficiency in dairy cattle." In Energy and protein metabolism and nutrition in sustainable animal production, 321–22. Wageningen: Wageningen Academic Publishers, 2013. http://dx.doi.org/10.3920/978-90-8686-781-3_111.

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Thatcher, W. W. "Dairy Cattle: Reproduction Management." In Encyclopedia of Animal Science, Second Edition, 273–76. CRC Press, 2011. http://dx.doi.org/10.1081/e-eas2-120019556.

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Thatcher, W. W. "Dairy Cattle: Reproduction Management." In Encyclopedia of Animal Science, 275–78. CRC Press, 2004. http://dx.doi.org/10.1201/9781482276664-83.

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Guss, Samuel B. "Reproduction Management for Dairy Cattle." In Dairy Science Handbook, 211–15. CRC Press, 2019. http://dx.doi.org/10.1201/9780429049361-23.

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Fuquay, J. W. "STRESS, HEAT, IN DAIRY CATTLE | Effects on Reproduction." In Encyclopedia of Dairy Sciences, 2611–18. Elsevier, 2002. http://dx.doi.org/10.1016/b0-12-227235-8/00478-8.

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Lucy, M. C., H. A. Garverick, and D. E. Spiers. "STRESS, MANAGEMENT INDUCED, IN DAIRY CATTLE | Effects on Reproduction." In Encyclopedia of Dairy Sciences, 2611–18. Elsevier, 2002. http://dx.doi.org/10.1016/b0-12-227235-8/00480-6.

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SPAIN, JAMES N., MATTHEW C. LUCY, and DAVID K. HARDIN. "Effects of Nutrition on Reproduction in Dairy Cattle." In Current Therapy in Large Animal Theriogenology, 442–50. Elsevier, 2007. http://dx.doi.org/10.1016/b978-072169323-1.50060-x.

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Conference papers on the topic "Dairy cattle reproduction"

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TRUKHACHEV, Vladimir, Sergey OLEYNIK, Nikolay ZLYDNEV, and Vitaliy MOROZOV. "SCREENING OF COMPLEX VERTEBRAL MALFORMATION (CVM) AND BOVINE LEUKOCYTE ADHESION DEFICIENCY (BLAD) IN THE AYRSHIRE CATTLE BREED IN THE NORTH CAUCASUS." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.142.

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The Ayrshire dairy breed is renowned for producing large quantities of high quality milk and, therefore, is frequently used for crossbreeding. However, various hereditary anomalies caused by gene mutations have been recently recorded in calves produced by some Ayrshire sires. Most of these anomalies were shown to have a recessive inheritance pattern, thus imposing a threat of unpredictable dramatic changes in cattle genotypes under such factors as genetic drift, selection and inbreeding. The purpose of this study was to examine the susceptibility of the Ayrshire cattle bred in the North Caucasus to such hereditary abnormalities as complex vertebral malformation (CVM) and bovine leukocyte adhesion deficiency (BLAD). The investigation was carried out on 16 cows with various phenotype and reproduction disorders that were selected based on a three-year veterinary observation of 440 livestock animals. The target group cows were generally the descendants of Hannulan Yaskiyri, Riihiviidan Urho Errant and O.R. Lihting. The results demonstrated that no animals under study were the carriers of these genetic disorders, which proved the mutant alleles of BLAD and CVM to be absent from the Ayrshire cattle livestock bred in the North Caucasus. Therefore, the sires of these cattle can be successfully used for breeding.
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TRUKHACHEV, Vladimir, Sergey OLEYNIK, and Nikolay ZLYDNEV. "FEATURES OF THE KARYOTYPE OF NORTH CAUCASUS AYRSHIRE DAIRY CATTLE POPULATION: DEFECTS IN REPRODUCTIVE FUNCTIONS." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.141.

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One of the ways of improving the genotypes of dairy cattle in Russia is to increase the proportion of the Ayrshire breed, which can be justly claimed to be one of the best dairy breeds in the world. However, due to the prevalence of large-scale breeding technologies, which involves the use of a limited contingent of dairy cattle bulls, including but not limited to the Ayrshire breed, the emergence of new-born calves with various anomalies, including chromosomal, which commonly have a hereditary basis attributable to gene mutations have been observed. Given that the bulk of these anomalies are acquired by recessive inheritance, they may not always manifest themselves in the phenotype and thus represent a hidden genetic load. In recent years, the significance of cytogenetic analysis and karyotyping is becoming increasingly important, not only when considering the theoretical assumptions, but also when solving applied problems aimed at preventing damage to agricultural production. This article presents the results of the cytogenetic analysis of Ayrshire cattle affected by reproductive problems. The following has been established: an absence of changes in the diploid set of the investigated dairy cattle (2n = 60); the presence of aberrant cells, whose frequency of occurrence amounted to 3.6% in the population of 440 head (number of aberrations per aberrant cell researched – 0.036 / 1.0); the absence of reciprocal translocations in the karyotype of the investigated population. It is suggested that the existing Ayrshire sires Hannulan Yaskiyri, Riihiviidan Urho Errant, O.R.Lihting and their descendants do not have a genetic load of chromosomal abnormalities.
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Azhar, H., M. Zamri Saad, F. FA Jesse, and S. Annas. "Retrospective Study on Milk Production and Reproductive Performance of Dairy Cattle in a Farm in Selangor, Malaysia." In Proceedings of International Seminar on Livestock Production and Veterinary Technology. Indonesian Center for Animal Research and Development (ICARD), 2016. http://dx.doi.org/10.14334/proc.intsem.lpvt-2016-p.157-162.

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Ponomarjova, Olga, Ilga Sematovica, Inga Piginka-Vjaceslavova, and Aida Vanaga. "Cattle (Bos Taurus) endometrium morphology on the seventh day of the estrous cycle." In Research for Rural Development 2020. Latvia University of Life Sciences and Technologies, 2020. http://dx.doi.org/10.22616/rrd.26.2020.021.

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The aim of our study was to describe the histopathological and cytological characteristic of the cow endometrium on the seventh day of the estrous cycle. In this study, 11 different breeds’ dairy cows (78.18 ± 37.46 months old, in 3.6 ± 2.17 lactation, the mean body condition score 3.4 ± 0.72 (5 points scale)) from Research and Study farm ‘Vecauce’ were selected. All cows were more than 210 days postpartum. Overall health and reproductive tract examination was performed, progesterone (P4) and estradiol (E2) concentration in blood serum were established and the biopsy and cytology samples of endometrium were taken. Mean E2 concentration was 14.92 ± 7.92 pg mL-1, mean P4 concentration was 13.64 ± 9.44 nmol L-1. The mean percentage in the cytology slides was established: epithelial cells 89 ± 9%, polimorphonuclear leukocytes (PMN) 6 ± 5%. Cytological subclinical endometritis (SE) was confirmed in 5 cows. Histopathological findings (out of 22 samples): endometrium stromal edema in 14, hemosiderin and hemosiderophages in 8, supranuclear vacuolization in 12, pseudodecidual reaction in 12 samples. No subnuclear vacuolization and mitosis in the glandular epithelium were detected. Histopathological examination did not reveal SE. Morphology between the uterine horns with and without corpus luteum (CL) and between cows with serum P4 level higher than 15 nmol L-1 and lower than 15 nmol L-1 were not statistically different (p>0.05). In conclusion, histopatological examination is more reliable diagnostic method for SE. Future investigation should be performed to establish cut-off values for the diagnosis of SE in cows more than 210 days postpartum.
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