Commencement of luteal activity in three different selection lines for milk yield and fertility in Norwegian Red cows
نویسندگان
چکیده
منابع مشابه
Association of milk yield and body condition score indices with the commencement of luteal activity after parturition in high producing dairy cows
The aim of the present study was to investigate the relation between different indices of milk yield andbody condition score (BCS) with the commencement of the luteal activity (C-LA) during the postpartumperiod in high producing dairy cows. Seventy-one multiparous healthy (free of detectable reproductivedisorders) Holstein dairy cows (mean peak milk yield = 56.7 ± 7.4 kg) were used in the prese...
متن کاملDefining appropriate model for genetic analysis of milk yield in different lactations of Iranian Holstein cows
In this study, appropriate genetic co (variance) structure across ages of milk production in the Iranian Holstein cows was modeled using 35167 records originated from 1098 sires and 27236 dams. These data were collected from 110 herds during 2011 to 2015 by the Iranian Animal Breeding Center. For all lactations, birth year, birth month, calving year, calving season, calving month, age and herd ...
متن کاملEstimation of Economic Values for Fertility, Stillbirth and Milk Production Traits in Iranian Holstein Dairy Cows
The objective of present study was to derive the economic values for number of inseminations to conception, calving interval, milk yield and stillbirth, using economic data of 10 Iranian Holstein herds. The economic values were derived by using the profit function methods and differentiating a profit equation with respect to the traits of interest. The cow fertility costs herd amortization or r...
متن کاملassociation of milk yield and body condition score indices with the commencement of luteal activity after parturition in high producing dairy cows
the aim of the present study was to investigate the relation between different indices of milk yield andbody condition score (bcs) with the commencement of the luteal activity (c-la) during the postpartumperiod in high producing dairy cows. seventy-one multiparous healthy (free of detectable reproductivedisorders) holstein dairy cows (mean peak milk yield = 56.7 ± 7.4 kg) were used in the prese...
متن کاملthe test for adverse selection in life insurance market: the case of mellat insurance company
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 2009
ISSN: 0022-0302
DOI: 10.3168/jds.2008-1295