Effects of breeding season length and calving season on range beef cow productivity
نویسندگان
چکیده
منابع مشابه
Effects 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 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 date, weaning date, and grazing season length on profitability of cow-calf production systems in southeastern Montana.
Production data from 11 southeastern Montana ranches were used to parameterize a bio-economic computer model of cow/calf range production. Effects of changes in breeding date, weaning date, and range removal date on system performance for a ranch with a fixed forage resource base (3,060 animal unit months of range forage and 744 t of hay) were simulated. Input costs were locally established in ...
متن کاملASC-132: Using MGA to Shorten the Beef Breeding Season
Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, C. Oran Little, Director of Cooperative Extension Service, University of Kentucky College of Agriculture, Lexington, and Kentucky State University, Frankfort. Issued 12-91—10M The MGA double-injection prostaglandin system offers cattlemen the opportunity ...
متن کاملA Model to Predict Breeding-season Productivity Formultibrooded Songbirds
--Breeding-season pr ductivity (the per capita number of offspring surviving to the end of the breeding season) is seldom estimated for multibrooded songbirds because of cost and logistical constraints. However, this parameter is critical for predictions of population growth rates and comparisons of seasonal productivity across geographic or temporal scales. We constructed a dynamic, stochastic...
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 1991
ISSN: 0021-8812,1525-3163
DOI: 10.2527/1991.6993453x