Milk and Fat Differences for Registered Cows Sired by Artificial and Natural Insemination
نویسندگان
چکیده
منابع مشابه
Cows' milk fat and human nutrition.
Composition of milk fa t Cows’ milk fat consists mainly of triglycerides (98-99 g/100 g) together with smaller amounts of phospholipids (0 .9 ~ / I W g), cholesterol (0.3 g/100 g), carotenoids (6-7 pg/g), vitamin A (6-8 pg/g), vitamin D (0-5 pg cholecalciferoV1 oo g) and trace concentrations of other fat-soluble substances such as lanosterol, P-sitosterol, saturated hydrocarbons, squalene, glyc...
متن کاملGenetic change in milk yield estimated from simultaneous genetic evaluation of bulls and cows.
Genetic trend for milk yield in the artificially sired Holstein population in the northeastern United States was estimated from solutions for simultaneous genetic evaluations of bulls and cows for an animal model using mixed model equations and including all known relationships among the population by years of birth of 1960 to 1980 (1978 for bulls). First lactation milk records of 1,074,971 art...
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Introduction Estrous synchronization and artificial insemination (AI) are reproductive management tools that have been available to beef producers for over 40 years. Synchronization of the estrous cycle has the potential to shorten the calving season, increase calf uniformity, and enhance the possibilities for utilizing AI. Artificial insemination allows producers the opportunity to infuse supe...
متن کاملSetting up Cows for First Postpartum Artificial Insemination
A long standing goal of reproductive physiologists was to develop a hormonal synchronization program that could overcome the problems and limitations associated with visual detection of estrus in dairy cattle. This goal was realized in 1995 with the publication of a hormonal synchronization protocol that combined GnRH and PGF2α to control ovarian physiology and is now commonly referred to as th...
متن کاملProduction Differences between Registered Cows and Their Nonregistered Herd-mates.
Within-herd contemporary comparisons of the first-lactation production of registered and nonregistered cows in herds enrolled in the New York Dail T Herd Improvement Associations suggest only small genetic differences between registered and nonregistered cows. In general, the registered Holsteins exceeded in production their nonregistered herd-mates, whereas the nonregistered cows had a slight ...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1974
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(74)84839-3