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Artykuły w czasopismach na temat „Beef cows”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 1 lutego 2022

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1

Hickson, R. E., R. L. Laven, N. Lopez-Villalobos, P. R. Kenyon, and S. T. Morris. "Postpartum anoestrous interval in first-lactation beef and dairy-beef crossbred cows." Animal Production Science 52, no. 7 (2012): 478. http://dx.doi.org/10.1071/an11288.

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In New Zealand, beef-breeding cows are required to wean a calf every year, and the weight of calf at weaning is a major driver of the efficiency of the breeding cow. Weaning weight can be increased by increasing milk yield of the cow such as by incorporating dairy breed genetics into the breeding cows, and by having early born calves which are, therefore, older at weaning. This experiment examined postpartum anoestrous interval and pregnancy rate to rebreeding in 109 beef-breed and beef-cross-dairy breed first-lactation cows suckling their own calves. Cows with a Jersey component had a shorter

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2

McGregor, B. A., and J. F. Graham. "Fibre production by beef cows." Animal Production Science 50, no. 6 (2010): 568. http://dx.doi.org/10.1071/an09219.

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Cattle grow and shed fibre which assists them adapt to seasonal changes in the environment. In the absence of cattle fibre production data for southern Australia, Angus, Hereford, Simmental and Limousin cows and crosses between these breeds grazing perennial pastures at Hamilton, Victoria were sampled in late winter. The fibre-growing area on the sides of cattle was measured, fibre sampled at the mid-side site and the sampling area determined. Fibre was tested for fibre diameter distribution, clean washing yield and fibre length measured. Cows were 3–7 years of age, liveweights were 412–712 kg

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3

Morter, Raymond L., Charles H. Armstrong, Harold E. Amstutz, and H. Leon Thacker. "Systemic Salmonellosis in Mature Beef Cows." Journal of Veterinary Diagnostic Investigation 1, no. 1 (January 1989): 22–24. http://dx.doi.org/10.1177/104063878900100108.

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Systemic infection of mature beef cows with Salmonella typhimurium resulted in death of cows, abortions, and premature births. Salmonella typhimurium was isolated from the kidney, liver, and spleen of cows but not from an aborted fetus. Diarrhea was not a prominent clinical feature of the epizootic. The source of the salmonella was not determined.

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4

Santos, N. R., G. C. Lamb, D. R. Brown, and R. O. Gilbert. "Postpartum endometrial cytology in beef cows." Theriogenology 71, no. 5 (March 2009): 739–45. http://dx.doi.org/10.1016/j.theriogenology.2008.09.043.

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Mathis, Clay P., and Jason E. Sawyer. "Nutritional Management of Grazing Beef Cows." Veterinary Clinics of North America: Food Animal Practice 23, no. 1 (March 2007): 1–19. http://dx.doi.org/10.1016/j.cvfa.2006.12.001.

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Lira, Stephen M., Jon T. Biermacher, Evan Whitley, and Devlon Ford. "185 Strategies for managing open beef cows." Journal of Animal Science 97, Supplement_1 (July 2019): 63. http://dx.doi.org/10.1093/jas/skz053.142.

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Abstract Open beef cows account for between 15 and 30% of a spring-calving cow/calf operation’s annual revenue; however, most producers commonly sell open cows at weaning when prices are at a seasonal low. A three-year (2015–2018) study was conducted using open beef cows (n = 244) from a spring-calving herd in south-central Oklahoma. The objective of the study was to determine whether or not the net return of retaining, feeding, rebreeding, and marketing rebred cows was greater than the revenue from selling open cows at weaning. Each year at weaning, open cows were sorted into Thin or Moderate

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7

Bailey, C. R., A. L. Goetsch, D. S. Hubbell, and C. F. Rosenkrans, Jr. "Effects of monensin on beef cow reproduction." Canadian Journal of Animal Science 88, no. 1 (March 1, 2008): 113–15. http://dx.doi.org/10.4141/cjas07082.

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This study was designed to evaluate the effects of monensin with or without grain supplementation on reproduction of beef cows consuming bermudagrass hay. Monensin supplemented at 200 mg head-1 d-1, with or without grain supplementation, shortened the period from calving to conception and increased calving percentage in beef cows consuming bermudagrass hay. Key words: Monensin, beef cows, reproduction

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8

Khakimov, Ismagil, Rinat Mudarisov, and Aleksandr Akimov. "BEEF COWS BODY CONDITION SCORING AND ITS MEASUREMENTS RELATIONSHIP." Bulletin Samara State Agricultural Academy 5, no. 2 (May 8, 2020): 40–46. http://dx.doi.org/10.12737/37338.

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The purpose of the study is improving the efficiency of breeding work in selection of cows by live weight, body measurements with mandatory consideration of animal condition score. The degree and nature of relationship be-tween live weight and body measurements of beef cows with condition score, regression coefficient were calculat-ed. The research was carried out on beef Hereford and Kazakh white-headed cows. A high positive relationship between live weight, body measurements and the condition score of cows was established. The regression coeffi-cient showed that change in finish by 1 point i

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9

Blasi, D. A., J. K. Ward, T. J. Klopfenstein, and R. A. Britton. "Escape protein for beef cows: III. Performance of lactating beef cows grazing smooth brome or big bluestem." Journal of Animal Science 69, no. 6 (1991): 2294. http://dx.doi.org/10.2527/1991.6962294x.

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10

Vaz, Ricardo Zambarda, José Fernando Piva Lobato, João Restle, Pablo Tavares Costa, Otoniel Geter Lauz Ferreira, Javier alexander Bethacourt Garcia, Lidiane Raquel Eloy, and João Luiz Benavides Costa. "Effect of live weight of beef cows on calf production efficiency." Research, Society and Development 9, no. 9 (September 2, 2020): e679007632. http://dx.doi.org/10.33448/rsd-v9i9.7632.

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The objective was to evaluate the development and reproductive performance of beef cows of different body weights at calving were evaluated. Milk yield and calf production efficiency were assessed in secundiparous Braford cows classified at calving according to weight as Light (325.2±3.7 kg), Moderate (347.7±4.0 kg), and Heavy (384.2±4.1 kg). Heavy cows had higher total milk yield than Light cows, but did not differ from Moderate, reflecting in calves weighing at weaning 82.1, 76.6, and 76.9 kg, respectively. Differences on pregnancy rates for Light (90.0%, 18 pregnant cows/2 of eligible cows)

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11

Carluccio, Augusto, Ippolito De Amicis, Monica Probo, Brunella Giangaspero, and Maria Cristina Veronesi. "Prevalence, survival and subsequent fertility of dairy and beef cows with uterine prolapse." Acta Veterinaria Hungarica 68, no. 1 (March 2020): 91–94. http://dx.doi.org/10.1556/004.2020.00017.

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AbstractThe aim of this study was to evaluate the prevalence of uterine prolapse in cows and assess its effects on survival and subsequent fertility. Of 33,450 calving cows considered retrospectively, 216 (0.6%) developed uterine prolapse. A higher prevalence was found in beef cows (n = 57/5,700 cows, 1%) compared to dairy cows (n = 157/27,750 cows, 0.6%). Treatment consisted of cleaning and replacing the uterus with local administration of antibiotics, and applying a harness for uterine containment. The recovery rate was 81.9% (n = 177), similar in dairy (n = 129; 81.1%) and beef (n = 48; 84.

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12

Hayanti, Sari Yanti, Amrozi Amrozi, Aryogi Aryogi, and Mokhamad Fakhrul Ulum. "Postpartum perineal muscle sonogram in Madura beef cow." Veterinary World 14, no. 2 (February 9, 2021): 380–92. http://dx.doi.org/10.14202/vetworld.2021.380-392.

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Background and Aim: Ultrasonography (USG) is useful for non-invasively identifying changes that occur in soft tissue architecture. The objective of this research was to demonstrate postpartum (PP) uterine involution through the changes of perineal muscle intensity and thickness in Madura beef cow by ultrasonography. Materials and Methods: Madura's breed cows used in the research consist of eight non-pregnant (NP) cows and three PP cow. The transrectal and transperineal USG imaging of NP cows was performed on days 1, 33, and 65. USG imaging of PP cows was performed every day starting from day 1

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13

Farias, Gustavo Duarte, Liliane Cerdótes, Ricardo Zambarda Vaz, João Restle, Marcia Ferreira Bitencourt, Dari Celestino Alves Filho, and Ivan Luiz Brondani. "Biological efficiency of Charolais beef cows of different body sizes." Semina: Ciências Agrárias 39, no. 4 (August 2, 2018): 1737. http://dx.doi.org/10.5433/1679-0359.2018v39n4p1737.

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This study aimed to evaluate the production, reproductive performance, and productive efficiency of predominantly Charolais cows and their calves (Straightbred, ¾ C, ¼ N) according to body size at calving. Sixty-three cow-calf pairs were used and classified into three weight groups: Light (331.3±5.8 kg), Moderate (385.9±5.3 kg), and Heavy (424.4±6.2 kg). The classes were formed using half standard deviations above or below the average weight of the cows at calving. For each pair, the body weight was evaluated at calving, at weaning (63 days), at the beginning and at end of the reproductive per

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14

Pochukalin, A. Ye, Yu M. Reznikova, S. V. Priyma, and O. V. Rizun. "BREEDING ACHIEVEMENT OF BEEF CATTLE-BREEDING OF UKRAINE: ZNAMENSK INTRABREED TYPE OF POLESSIAN BEEF BREED." Animal Breeding and Genetics 52 (November 1, 2016): 94–108. http://dx.doi.org/10.31073/abg.52.12.

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The aim of our research was to conduct a retrospective analysis and to study the current state of the subjects breeding Znamensk intrabreed type of Polessian Beef breed and to assess main economically useful traits and genealogical structure. Material and methods. Research of productive and economic activity of breeding farms has been carried out based on the electronic database of State Register of Breeding Subjects in Livestock for 2003-2016. Analysis of the number of breeding animals, distribution of cows by age, animals’ live weight, milk (as a calf’s live weight at the age of 7 mont

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15

Vara, Carina Crizel da, Magali Floriano da Silveira, Ricardo Zambarda Vaz, João Restle, Diego Soares Machado, and Stefani Macari. "Body size in beef cows and its influence on calf production." Semina: Ciências Agrárias 41, no. 6supl2 (November 6, 2020): 3299–310. http://dx.doi.org/10.5433/1679-0359.2020v41n6supl2p3299.

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Cattle farming becomes more intensive when the productive efficiency of the cows is increased, and nutrition is adjusted to the animal biotype. Eighty purebred Charolais and Nellore cows and their crosses between 3 and 7 years of age, were grouped for body weight at calving into Light (332.6 kg), Moderate (385.3 kg) and Heavy (444.6 kg). Cows and their calves were weighed at calving, at 63 days (early weaning) and at 210 days. The estimated milk production of the cows was evaluated by manual milking at 21, 42 and 63 days postpartum. The difference in the weight of the cows at calving was maint

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16

Buddenberg, B. J., C. J. Brown, Z. B. Johnson, and R. S. Honea. "Maternal Behavior of Beef Cows at Parturition." Journal of Animal Science 62, no. 1 (January 1, 1986): 42–46. http://dx.doi.org/10.2527/jas1986.62142x.

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Russel, A. J. F., I. A. Wright, and E. A. Hunter. "Factors Affecting Reproductive Efficiency in Beef Cows." Proceedings of the British Society of Animal Production (1972) 1989 (March 1989): 136. http://dx.doi.org/10.1017/s0308229600011260.

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Successful and timely rebreeding is of major importance to the economics of suckler cow enterprises. Research into the causes of reprodutive failure and extended calving intervals can be difficult, not least because of the need for experiments involving large numbers of animals if statistically significant treatment effects are to be demonstrated. Useful information however, can be obtained from the analysis of data derived from a number of relatively small-scale experiments, not necessarily on reproduction per se, but in which records of reproductive performance are available.This paper deals

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18

Diskin, M. G., and D. A. Kenny. "Managing the reproductive performance of beef cows." Theriogenology 86, no. 1 (July 2016): 379–87. http://dx.doi.org/10.1016/j.theriogenology.2016.04.052.

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Hoyt, Phillip G., Marjorie S. Gill, Kenneth L. Angel, Stephen D. Gaunt, Sharon M. Dial, and Ricky M. Landreneau. "Corticosteroid-responsive thrombocytopenia in two beef cows." Journal of the American Veterinary Medical Association 217, no. 5 (September 2000): 717–20. http://dx.doi.org/10.2460/javma.2000.217.717.

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20

Dorn, C. G., J. F. Baker, R. Knutson, and D. C. Kraemer. "Embryo recovery from early postpartum beef cows." Theriogenology 31, no. 1 (January 1989): 184. http://dx.doi.org/10.1016/0093-691x(89)90592-x.

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21

Roche, J. F., M. A. Crowe, and M. P. Boland. "Postpartum anoestrus in dairy and beef cows." Animal Reproduction Science 28, no. 1-4 (July 1992): 371–78. http://dx.doi.org/10.1016/0378-4320(92)90123-u.

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Hetzel, D. J. S., M. J. Mackinnon, R. Dixon, and K. W. Entwistle. "Fertility in a tropical beef herd divergently selected for pregnancy rate." Animal Science 49, no. 1 (August 1989): 73–81. http://dx.doi.org/10.1017/s0003356100004268.

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ABSTRACTSelection on the basis of estimated breeding value for cow fertility was successful in establishing two distinct lines of high (H) and low (L) fertility in a herd of Droughtmaster (Brahman × Shorthorn) cattle. The average difference in pregnancy rates over 3 years between the H and L line was 12% (P < 0·01) in the selected cows. In lactating cows this difference was 17% indicating that lactational anoestrus was an important component of the line difference in fertility. The total calf losses between confirmed pregnancy and weaning were 17%, but there were no line differences. Cow mo

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23

Higdon, H. L., P. G. Parnell, J. E. Hill, and J. C. Spitzer. "Streptozocin-induced Pancreatic Islet Destruction in Beef Cows." Veterinary Pathology 38, no. 6 (November 2001): 715–20. http://dx.doi.org/10.1354/vp.38-6-715.

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Streptozocin (STZ) induces diabetes mellitus in sheep and pigs. To test the effect of STZ in cattle, cows were given 75–150 mg STZ per kilogram of body weight. Cows receiving 150 mg/kg required euthanasia within 24 hours after infusion because of the severe systemic effects of STZ. Seven cows receiving doses of ≤100 mg/kg had mild to marked decrease in islet immunoreactivity for insulin and in pancreatic islet density and mild to severe tubulointerstitial nephritis. Two cows receiving 75 and 85 mg/kg STZ regained their ability to produce insulin and return blood glucose to basal levels. One co

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Finger, A., K. P. Patison, B. M. Heath, and D. L. Swain. "Changes in the group associations of free-ranging beef cows at calving." Animal Production Science 54, no. 3 (2014): 270. http://dx.doi.org/10.1071/an12423.

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Dyadic association between individuals forms the basis of group structures for herding animals. Group associations and social bonds are dynamic and can result in the establishment of new subgroups. The onset of parturition and the introduction of an offspring create a social change for a mother that is part of a herd. There is a need to nurture the young, develop and maintain a strong maternal bond, and build or maintain social networks within the larger herd. The present study explored associations within a herd of cattle that included pregnant cows and cows with calves (maternal cows). Group

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Worthington, Mary Clarke, Grace C. Ott, Matthew H. Poore, and Carrie L. Pickworth. "57 Impact of weaning strategy on beef cow performance." Journal of Animal Science 97, Supplement_1 (July 2019): 1. http://dx.doi.org/10.1093/jas/skz053.000.

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Abstract It has been shown that physiologic stress in beef cattle can impact animal performance. Weaning stress is recognized as a major stress in a calf’s life. However, less is known of its impacts on the dam or developing fetus, as the dam is at the end of the second trimester at weaning. Therefore, the objective was to investigate the impact of weaning stress on cow performance. A total of 240 cows from two locations were assigned to one of three weaning strategies: abrupt removal of the calf on d 0 (n = 80), d 7 cow-calf fenceline contact (n = 81), and late weaning on d 84 (n = 79). Cows

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Worthington, Mary Clarke, Grace C. Ott, Matthew H. Poore, and Carrie L. Pickworth. "48 Impact of weaning strategy on beef cow performance." Journal of Animal Science 97, Supplement_1 (July 2019): 83. http://dx.doi.org/10.1093/jas/skz053.190.

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Abstract It has been shown that physiologic stress in beef cattle can impact animal performance. Weaning stress is recognized as a major stress in a calf’s life. However, less is known of its impacts on the dam or developing fetus, as the dam is at the end of the second trimester at weaning. Therefore, the objective was to investigate the impact of weaning stress on cow performance. A total of 240 cows from two locations were assigned to one of three weaning strategies: abrupt removal of the calf on d 0 (n = 80), d 7 cow-calf fenceline contact (n = 81), and late weaning on d 84 (n = 79). Cows

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McCaughey, W. P., K. Wittenberg, and D. Corrigan. "Impact of pasture type on methane production by lactating beef cows." Canadian Journal of Animal Science 79, no. 2 (June 1, 1999): 221–26. http://dx.doi.org/10.4141/a98-107.

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In order to determine the quantity of methane (CH4) produced by lactating beef cows on pasture, 16 Hereford–Simmental first-calf heifers with a mean weight of 511.2 ± 5.8 kg were randomly selected from a larger group of cows (n = 60) on a grazing management experiment and used to evaluate the effects of pasture type on ruminal CH4 production using the sulfur hexafluoride (SF6) tracer-gas technique. Pasture treatments consisted of two pasture types, alfalfa-grass [78% alfalfa (Medicago sativa L.) – 22% meadow bromegrass (Bromus biebersteinii Roem and Schult.)] or 100% meadow bromegrass at each

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Wright, I. A., J. R. Jones, T. J. Maxwell, A. J. F. Russel, and E. A. Hunter. "The effect of genotype × environment interactions on biological efficiency in beef cows." Animal Production 58, no. 2 (April 1994): 197–207. http://dx.doi.org/10.1017/s1357729800042508.

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AbstractAn experiment was conducted to examine the response of three genotypes of beef cows to contrasting levels of nutrition supplied from grazed pasture. Twenty-two Hereford × Friesian (HF), 20 Aberdeen Angus × Friesian (AF) and 24 Welsh Black (WB) spring-calving beef cows with their Charolais-cross calves were used in 4 years consecutively. During the summer grazing period they grazed permanent pasture maintained at either 4 to 5 cm (short) or 7 to 8 cm (tall) sward surface height. Sward height treatment significantly (P < 0·001) affected cow and calf live-weight gain (0·498 v. 0·041 (s

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DEGEN, A. A., and B. A. YOUNG. "THE PERFORMANCE OF PREGNANT BEEF COWS RELYING ON SNOW AS A WATER SOURCE." Canadian Journal of Animal Science 70, no. 2 (June 1, 1990): 507–15. http://dx.doi.org/10.4141/cjas90-062.

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Body mass change, water influx, metabolic heat production and rectal temperature were measured in four pregnant beef cows offered only snow as a water source (snow cows) and in four pregnant beef cows that also had access to heated water (water cows). The study was carried out during winter (December to March) in Alberta, Canada. There was no difference between treatment groups in any of these measurements indicating that the snow cows were obtaining adequate water to satisfy their requirements and that no added nutrient energy was required to melt the snow and bring the water to body temperat

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Hand, R. K., L. A. Goonewardene, B. J. Yaremcio, and R. Westra. "A study on the prevalence of cracked claws among beef cows." Canadian Journal of Animal Science 72, no. 1 (March 1, 1992): 165–68. http://dx.doi.org/10.4141/cjas92-019.

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A survey of the prevalence of vertical (sand) cracks on claws of cows on pasture in northwest Alberta found 261 out of 1183 or 22.7% cows affected. Among cows with cracks, 62% had a single crack while 29% had two cracks. There were significantly (P = 0.00001) more cracks on the outside (80.6%) compared with the inside (19.4%) claw. Significantly (P = 0.0002) more of the severe cracks were found on the outside claw. Key words: Claw, cracks, cows, severity, prevalence

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31

Borges, Luiz Felipe Kruel, Rogério Ferreira, Lucas Carvalho Siqueira, Rodrigo Camponogara Bohrer, Jacson William Borstmann, João Francisco Coelho de Oliveira, and Paulo Bayard Dias Gonçalves. "Artificial insemination system without estrous observation in suckled beef cows." Ciência Rural 39, no. 2 (November 14, 2008): 496–501. http://dx.doi.org/10.1590/s0103-84782008005000075.

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The aim was to develop a timed artificial insemination (TAI) system in suckled beef cows. Cows (n=227), 60-80 days postpartum, received estradiol benzoate (5mg) and a vaginal device containing 250µg of medroxyprogesterone acetate (MPA; day 0). On day six, cloprostenol (125µg) and eCG (400IU) were administrated and calves were weaned for 88h. The devices were removed on day seven (BioRep group) or on day eight (TAI group). All cows of TAI group and cows of BioRep group that did not exhibit standing estrus received GnRH (100µg) on day 9. In experiment I, the follicular growth was monitored daily

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Fan, L. Q., J. W. Wilton, and P. E. Colucci. "Genetic parameters for feed intake and efficiency in lactating beef cows." Canadian Journal of Animal Science 76, no. 1 (March 1, 1996): 81–87. http://dx.doi.org/10.4141/cjas96-011.

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Genetic parameters of feed intake and efficiency and production traits for lactating beef cows were estimated from data collected from 1980 to 1988 at the Elora Beef Research Centre, Guelph, Ontario. Estimates were obtained using restricted maximum likelihood (REML) with an individual animal model with year–season–treatment, sex of calf, parity, breeding system, covariate daily change of backfat depth and direct genetic and permanent environmental effects. The data included 1174 observations, 511 cows, 369 dam–maternal grand dam pairs and 245 sires of cows. Feed efficiency for milk was calcula

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Farrell, Lydia J., Stephen T. Morris, Paul R. Kenyon, and Peter R. Tozer. "Simulating Beef Cattle Herd Productivity with Varying Cow Liveweight and Fixed Feed Supply." Agriculture 11, no. 1 (January 6, 2021): 35. http://dx.doi.org/10.3390/agriculture11010035.

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The liveweight of New Zealand beef cows has increased in recent decades due to selection for higher growth rates. Published data suggest that the efficiency of beef cow production decreases with increasing cow liveweight. Changes in beef herd size, feed demand, production, and cash operating surplus (COS) were simulated with average mature cow liveweight varied to 450, 500, 550, and 600 kg. With total annual beef feed demand fixed at the same level, in all scenarios cow numbers and numbers of weaned calves decreased with increasing cow liveweight. When the model was run with consistent efficie

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WILTON, J. W., J. McWHIR, G. K. MACLEOD, and G. J. KING. "GENOTYPE-NUTRITION INTERACTION FOR REPRODUCTION OF BEEF COWS." Canadian Journal of Animal Science 67, no. 3 (September 1, 1987): 789–95. http://dx.doi.org/10.4141/cjas87-081.

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Two levels of feed during early lactation (70 and 100% of NRC requirements) were used for five groups of genotypes (Herefords, small beef breed crosses, large beef breed crosses, small beef by dairy crosses and large beef by dairy crosses). Days to first ovulation (DFO), days to pregnancy (DP) and pregnancy rates were measured over 2 yr. No interaction of feed level by breed group was found for any measure of reproductive performance, milk yield or weaning weight of calf. The lower level of feeding significantly decreased DFO (by 6 d) and DP (by 5 d). Dairy crosses had similar DFO to Hereford,

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NKUUHE, J. R., and J. G. MANNS. "RELATIONSHIP BETWEEN TIME OF PROSTAGLANDIN INJECTION AND OVULATION IN BEEF CATTLE." Canadian Journal of Animal Science 65, no. 2 (June 1, 1985): 405–9. http://dx.doi.org/10.4141/cjas85-047.

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Experiments were conducted to determine whether the time of day when a luteolytic dose of PGF is given affects the time of onset of estrus and ovulation in cattle. Two similar experiments were conducted with a total of 14 cows and 10 heifers. Animals were divided into two equal groups, A and B, and 25 mg of PGF was injected at either 0600 or 1800 h. Overall, the times from PGF injection to the onset of estrus, LH peak or ovulation were not affected (P > 0.05) by the time of day (0600 vs. 1800 h) PGF was given. However, when data on heifers and cows were analyzed separately, the LH peak appe

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FREDEEN, H. T., G. M. WEISS, G. W. RAHNEFELD, DOUG WARD, J. E. LAWSON, and J. A. NEWMAN. "BEEF CATTLE REPRODUCTION IN RELATION TO THE ENVIRONMENT." Canadian Journal of Animal Science 68, no. 1 (March 1, 1988): 15–28. http://dx.doi.org/10.4141/cjas88-002.

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Results are reported from a 10-yr study of lifetime reproductive performance of beef cows maintained under two contrasting environments. The data comprised records for 8160 cow years. The breeding herds were maintained for 6 yr in accordance with the management practices conventional to each location with winter management changed (to drylot feeding) for the final 4 yr. Location differences in cow performance favored the herd maintained under semi-intensive management (Brandon, Manitoba). Conception rates were higher, calf mortality lower, and calf gains preweaning greater than recorded for th

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Weik, Franziska, Rebecca E. Hickson, Stephen T. Morris, Dorian J. Garrick, and Jason A. Archer. "Genetic Parameters for Maternal Performance Traits in Commercially Farmed New Zealand Beef Cattle." Animals 11, no. 9 (August 26, 2021): 2509. http://dx.doi.org/10.3390/ani11092509.

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Maternal performance is a major driver of profitability in cow-calf beef cattle enterprises. The aim of this research was to evaluate the inheritance of maternal performance traits and examine the intercorrelation among reproduction, live weight, hip height, body condition and maternal contribution to calf weaning weight in 15-month-old heifers, 2-year-old cows and mature cows in New Zealand beef herds. Data were collected on a total of 14,241 cows and their progeny on five commercial New Zealand hill country farms. Heritabilities were low for reproductive traits in heifers and mature cows (0–

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NAASZ, C. D., and H. L. MILLER. "EFFECTS OF BULL EXPOSURE ON POSTPARTUM INTERVAL AND REPRODUCTIVE PERFORMANCE IN BEEF COWS." Canadian Journal of Animal Science 70, no. 2 (June 1, 1990): 537–42. http://dx.doi.org/10.4141/cjas90-065.

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One hundred and thirteen spring calving beef cows were utilized to study the effect of bull exposure during the early postpartum period on return to estrus and fertility. In the spring of 1985 and 1986, cows were randomly exposed to epididymectomized bulls (BE) 3–7 d after calving until beginning of the breeding season (n = 37, 1985; n = 20, 1986) or not exposed to bulls (NE) (n = 35, 1985; n = 21, 1986). Cows were observed for estrus twice daily beginning approximately 4 wk after the start of calving until synchronization. Estrous cycles of all cows were synchronized with Syncro-Mate B® (SMB)

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Cavestany, D., N. Negrin, R. Negrin, and J. F. Groth. "Response of beef heifers and non-suckling beef cows to different oestrous synchronization protocols." Animal Science 74, no. 3 (June 2002): 547–52. http://dx.doi.org/10.1017/s135772980005270x.

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AbstractThe objective was to evaluate different oestrous synchronization schemes in beef cattle under range conditions. In experiment 1, 202 heifers averaging 26 months of age were assigned randomly to three treatments: (a) GnRH-PG. (no. = 44) day 0 (D0): injection of GnRH; D7: injection of PGF2α; D0 to D25 oestrous detection (OD) and artificial insemination (AI); (b) OD-PG. (no. = 45) D0 to D4; OD + AI; D5: injection of PGF2α; D5 to D25 OD + AI; and (c)Ovsynch. (no. = 113) D0: injection of GnRH; D7: injection of PGF2α; D9: injection of GnRH and 16 h later AI at fixed time. In experiment 2, 31

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Lopes, Sidnei Antônio, Mário Fonseca Paulino, Edenio Detmann, Luciana Navajas Rennó, Ériton Egídio Lisboa Valente, Carla Heloísa Avelino Cabral, Victor Valério de Carvalho, Josilaine Aparecida da Costa Lima, Marcos Rocha Manso, and Hugo Colombarolli Bonfá. "Evaluation of grazing beef cows receiving supplements with different protein contents." Semina: Ciências Agrárias 37, no. 5 (October 26, 2016): 3361. http://dx.doi.org/10.5433/1679-0359.2016v37n5p3361.

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The aim of this study was to evaluate the effects of supplementation with different crude protein contents on the productive performance of grazing beef cows during post-calving. Thirty-six beef cows, with age and average body weight of 5 years and 490±17.9 kg, respectively, were used. The experimental design was completely randomized. The treatments were: control = cows received only mineral mixture ad libitum; supplemented = cows received 1 kg d-1 of supplement containing 80, 200, or 320 g crude protein (CP) kg-1. There was no effect (P ? 0.16) of supplementation on voluntary intake. A linea

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Frasier, W. Marshall, and George H. Pfeiffer. "Optimal Replacement and Management Policies for Beef Cows." American Journal of Agricultural Economics 76, no. 4 (November 1994): 847–58. http://dx.doi.org/10.2307/1243746.

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Hopman, Bruce, and Dale W. Weber. "Effect of Lasalocid on Fall-Calving Beef Cows." Journal of Animal Science 63, no. 6 (December 1, 1986): 1722–27. http://dx.doi.org/10.2527/jas1986.6361722x.

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Chang, Ching-Fong, and Jerry J. Reeves. "Postpartum Interval in Beef Cows Shortened by Enclomiphene2." Journal of Animal Science 65, no. 1 (July 1, 1987): 217–23. http://dx.doi.org/10.2527/jas1987.651217x.

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Garcia-Winder, M., P. E. Lewis, and E. K. Inskeep. "Ovulation in Postpartum Beef Cows Treated with Estradiol." Journal of Animal Science 66, no. 1 (January 1, 1988): 1–4. http://dx.doi.org/10.2527/jas1988.6611.

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Adams, D. C., M. K. Nielsen, W. H. Schacht, and R. T. Clark. "Designing and conducting experiments for range beef cows." Journal of Animal Science 77, E-Suppl (2000): 1. http://dx.doi.org/10.2527/jas2000.77e-suppl1u.

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Yavas, Y., and J. S. Walton. "Postpartum acyclicity in suckled beef cows: A review." Theriogenology 54, no. 1 (July 2000): 25–55. http://dx.doi.org/10.1016/s0093-691x(00)00323-x.

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DiCostanzo, A., J. C. Meiske, and S. D. Plegge. "Characterization of energetically efficient and inefficient beef cows." Journal of Animal Science 69, no. 4 (1991): 1337. http://dx.doi.org/10.2527/1991.6941337x.

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Rook, Joseph S. "Pregnancy Toxemia of Ewes, Does, and Beef Cows." Veterinary Clinics of North America: Food Animal Practice 16, no. 2 (July 2000): 293–317. http://dx.doi.org/10.1016/s0749-0720(15)30107-9.

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Pleasants, A. B., and R. A. Barton. "Pre-calving nutrition of Angus beef breeding cows." New Zealand Journal of Experimental Agriculture 13, no. 3 (July 1985): 231–34. http://dx.doi.org/10.1080/03015521.1985.10426087.

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JUDSON, GJ, JD McFARLANE, A. MITSIOULIS, and P. ZVIEDRANS. "Vitamin B12responses to cobalt pellets in beef cows." Australian Veterinary Journal 75, no. 9 (September 1997): 660–62. http://dx.doi.org/10.1111/j.1751-0813.1997.tb15365.x.

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