Results 201 to 210 of about 336,156 (254)

Developing replacement beef heifers

Theriogenology, 2008
The replacement heifer represents the next generation of genetic progress for the cow herd. Producers invest a substantial amount of capital in these females, even if they fail to become pregnant. In order to get a return on this investment, it is imperative that these heifers become pregnant early in the first breeding season, calve with a minimum of ...
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Performance of beef heifers supplemented with sodium lasalocid

Tropical Animal Health and Production, 2016
This study was conducted on 78 13-month-old crossbred beef heifers that weighed 215 kg in Southern Rio Grande do Sul (RS) State, Brazil. We evaluated the performance of beef heifers that were reared in a pasture system that received a mineral supplement energy-type protein with added sodium lasalocid (LAS).
Everton Dezordi, Sartori, Leonardo Canali, Canellas, Gabriel Ribas, Pereira, Fernanda Gomes, Moojen, Helena Robatini, Carvalho, Júlio Otávio Jardim, Barcellos   +5 more
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Induced Tritrichomonas foetus infection in beef heifers

Journal of the American Veterinary Medical Association, 1990
Summary Four virgin beef heifers were inoculated intravaginally with 7 × 106 Tritrichomonas foetus organisms. Protozoal colonization of the vagina, cervix, and uterus developed within the first week after inoculation. Protozoa were no longer detected in secretions from these regions at approximately the same time in each heifer.
S Z, Skirrow, R H, BonDurant
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The effect of parasite control on fertility in beef heifers

Veterinary Parasitology, 1991
The effect of anthelmintic treatment on the growth and conception rate in beef heifers was studied in southwestern Virginia, USA. Forty mixed-breed heifers were divided into two groups at weaning and placed on experimental pastures. Control heifers did not receive anthelmintic treatment, while animals in the treatment group were given ivermectin (200 ...
A M, Zajac, J W, Hansen, W D, Whittier, D E, Eversole   +3 more
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Serum copper concentrations in beef cows and heifers

Journal of the American Veterinary Medical Association, 1999
Objective To characterize serum copper status of cows and heifers in beef cow-calf herds throughout the United States and to evaluate use of copper supplements in those herds. Design Cross-sectional survey. Animals 2,007 cows and heifers from 256 herds in 18 states.
D A, Dargatz, F B, Garry, G B, Clark, P F, Ross   +3 more
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Sexual stimulation as a luteolytic inductor in beef heifers

Theriogenology, 2019
The objective was to determine if the introduction of androgenized steers or females in oestrus has luteolytic effects during the advanced luteal phase (Day 12-13 of the cycle, Day of ovulation = Day 0) in heifers by analysing the changes in corpus luteum (CL) size and perfused area together with progesterone (P4) secretion.
María Victoria, Felipez, Tomás, Acosta, Rodolfo, Ungerfeld   +2 more
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Progestin and Prostaglandin for Estrous Synchronization in Beef Heifers

Journal of Animal Science, 1986
Seventy-eight Simmental-Angus-Hereford crossbred yearling heifers, in 1983, and 99 similar heifers, in 1984, were used to compare two estrous synchrony regimens. One treatment group (SMB) was synchronized using the commercially available Syncro-Mate-B procedure, which involved placing a norgestomet implant in the ear for 9 d and giving an injection of ...
J C, Whittier, G H, Deutscher, D C, Clanton   +2 more
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Factors Influencing Calving Difficulty in Beef Heifers

Journal of Animal Science, 1989
Records of 547, 2-yr-old heifers of three breed groups were used to evaluate the relative influence of dam's body and pelvic measurements, calf birth weight, sire birth weight and some relative measures (ratios) of calf birth weight and dam weight at calving on calving difficulty. The data were analyzed by regression and least squares procedures.
A, Naazie, M M, Makarechian, R T, Berg
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Endometrial biopsy inBos indicusbeef heifers

Reproduction in Domestic Animals, 2017
ContentsAn endometrial biopsy allows for a comprehensive assessment of the uterine environment of a breeding female. Although routine in mares, devices used for endometrial biopsies are impracticable in heifers due to the size and structure of the cervix.
O Ramirez‐Garzon, N Satake, RE Lyons, J Hill, MK Holland, M McGowan   +5 more
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Nutritional management of replacement beef heifers: a review

Journal of Animal Science, 1993
Systems to produce replacement heifers to calve initially at 2 yr of age and at 12-mo intervals thereafter require integrated forage-animal management plans. The process of developing heifers as replacements must begin during the cow-calf production phase.
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