Reproductive efficiency of F1 and reciprocal backcross beef cows under contrasting environments
نویسندگان
چکیده
منابع مشابه
Treatments to Optimize the Use of Artificial Insemination and Reproductive Efficiency in Beef Cattle under Tropical Environments
Bos indicus cattle, the preferred genetic group in tropical climates, are characterized by having a lower reproductive efficiency than Bos taurus. The reasons for the poorer reproductive efficiency of the Bos indicus cows include longer lengths of gestation and postpartum anestrus, a short length of estrous behavior with a high incidence of estrus occurring during the dark hours, and puberty at...
متن کاملReproductive Efficiency of Cows of Different Sizes
The effect of cow size on reproduction has become of in, respectively. The hip heights of the small, medium greater concern in recent years as a result of marked and large frame-size bulls used were 53, 55 and 57.5 in, increases in cow size in both purebred and commercial respectively, at 2 yr of age. The bulls were selected from herds and the extremely large effect of fertility on the within t...
متن کاملEndocrine and reproductive response of beef cows to PMSG.
Thir ty-one 3-year-old Angus cows and 23 2-year-old Angus heifers were randomly allotted to two t rea tment groups to examine the influence o f PMSG on endocr ine and reproductive responses. Sixteen cows and 11 heifers received a single subcutaneous inject ion of 2,000 IU PMSG on day 17 o f the estrous cycle (Trt 17); 15 cows and 12 heifers received 1,500 IU PMSG on day 5 and 2,000 IU on day 17...
متن کاملOptimising reproductive performance of beef cows and replacement heifers.
A reproductively efficient beef cow herd is fundamental to meeting the protein and specifically, red meat demand of an ever increasing global population. However, attaining a high level of reproductive efficiency is underpinned by producers being cognisant of and achieving many key targets throughout the production cycle and requires significant technical competency. The lifetime productivity o...
متن کاملEvaluation of biological efficiency of free-grazing beef cows under semidesert conditions.
Effects of cow BW, hip height, and estimated genetic potentials (EBV) for weaning weight direct and milk on cow productivity, fecal OM output, OM intake, and efficiency (kilograms of calf BW/kilogram of OM intake by the cow) were evaluated with 44 free-grazing crossbred cows under semidesert conditions. Calf BW were measured during early, mid-, and late lactation. Data were collected in four pe...
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ژورنال
عنوان ژورنال: Canadian Journal of Animal Science
سال: 1991
ISSN: 0008-3984,1918-1825
DOI: 10.4141/cjas91-118