Phenotypic Study of Lactation Curve in Iranian Holsteins
نویسندگان
چکیده
منابع مشابه
phenotypic study of lactation curve in iranian holsteins
a total of 136,250 monthly test day milk records collected from 13,625 iranian holstein heifers (three times a day milking) calved between 1991 and 2001 and distributed over 264 herds were used to study the effects of some environmental factors influencing lacta-tion curve parameters as well as production characteristics. wilmink’s function (yt = w0 + w1t + w2e-0.05t) was fitted to individual l...
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Effects of twinning on lactation and days open in Holsteins.
Effects of twinning on lactation and days open in Holsteins were studied from calving records compiled by member surveys of Eastern Artificial Insemination Cooperative. Records of cows with 305-day mature-equivalent records from the Northeast Dairy Records Processing Laboratory were grouped according to whether the twin calving was associated with dystocia. Records of each cow that had a twin c...
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ژورنال
عنوان ژورنال: Journal of Animal and Veterinary Advances
سال: 2010
ISSN: 1680-5593
DOI: 10.3923/javaa.2010.721.725