Calving sub-season and reproductive efficiency of beef cows
نویسندگان
چکیده
منابع مشابه
Genetics of reproductive performance in seasonal calving beef cows and its association with performance traits.
Due primarily to a lack of phenotypic data, little research has been undertaken on the genetics of reproductive performance in beef cattle. The objective of this study was to quantify, using data from the Irish national cattle herd, the contribution of additive genetics to phenotypic differences in reproductive performance in beef cattle and to investigate whether routinely available early pred...
متن کاملFactors Affecting the Efficiency with Which Beef Cows Become Pregnant after Calving in Northern Australia
Michael McGowan, Kieren McCosker, Geoffry Fordyce, Dave Smith, Nigel Perkins, Peter O’Rourke, Tamsin Barnes, Louise Marquart, Don Menzies, Tom Newsome, Di Joyner, Nancy Phillips, Brian Burns, John Morton and Sandi Jephcott. 1 The University of Queensland, Gatton, Qld 4343. 2 NT Dept of Primary Industry and Fisheries, Katherine, NT 0851. 3 QAAFI, The University of Queensland, St Lucia, Qld 4072....
متن کاملBreeding Season Length Versus Calving Percentage in Beef Cattle Herds
Long breeding seasons result in long calving seasons. This results in calvings distributed through a range of environmental and nutritional conditions and a disparity in calf maturity at any planned weaning time. It also results in cows entering their period of maximal nutritional requirements over the same range of environmental conditions. Attempts to increase cow and calf productivity often ...
متن کاملEffects of breeding season length and calving season on range beef cow productivity.
A 5-yr study was conducted beginning in 1983 with 460 cows to evaluate the effects of three breeding seasons (30, 45, and 70 d in length) and two times of spring calving, March (early) and April (late), on cattle production under Nebraska Sandhills range conditions. Criteria evaluated included pregnancy and weaning percentages, calving date and distribution, cow weights and body condition at fo...
متن کاملInfluence of body condition at calving and postpartum nutrition on endocrine function and reproductive performance of primiparous beef cows.
The influences of body condition score (BCS) at calving and postpartum nutrition on endocrine and ovarian functions, and reproductive performance, were determined by randomly allocating thin (mean BCS = 4.4 +/- 0.1) or moderate condition (mean BCS = 5.1 +/- 0.1) Angus x Hereford primiparous cows to receive one of two nutritional treatments after calving. Cows were fed to gain either 0.45 kg/d (...
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ژورنال
عنوان ژورنال: Revista Brasileira de Zootecnia
سال: 2010
ISSN: 1516-3598
DOI: 10.1590/s1516-35982010001000012