| Titles |
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English :
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Phenotypic and genetic parameters of milk production traits of a holstein commercial herd in Egypt
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| Abstract |
A total number of 2245 lactation records of 867 cows sired by 288 bulls were used to study milk production characteristics at the Holstein herd of the International Company for Animal Wealth. Heritability estimates for milk yield traits were calculated and genetic and phenotypic correlations among these traits were also investigated. Statistical analyses were performed using SAS (1996) and DF-REML (Meyer, 1998).
Means of actual 305-day milk yield, annualized milk yield and Milk per day of cow age were 7128 kg, 6680 kg and 9.78 kg/day, respectively. Origin of the cow (imported or locally born) showed no significant effect on any of the milk production traits studied while year-season of calving affected all traits (P<0.0001). Also, parity influenced (P<0.0001) all traits. Milk production declined gradually after the second lactation.
It can be concluded that Holstein cows, raised under the intensive system applied at commercial farms, can maintain high milk production.
Keywords: Holstein, genetic parameters, milk production traits, Egypt.
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| Publication year |
2001
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| Pages |
87-96
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| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
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| Availability number |
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| Organization Name |
Animal Production Research Institute (APRI)
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| serial title |
Egyptian Journal Animal Production
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| Author(s) from ARC |
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| External authors (outside ARC) |
سامح عبد الفتاح محمد عبد السلام
جامعة القاهرة
سامى ابو بكر
جامعة القاهرة
محمد عبد العزيز محمد
جامعة القاهرة
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| Agris Categories |
Animal husbandry
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AGROVOC
TERMS |
Egypt.
Genetic parameters.
Herds.
Milk production.
Phenotypes.
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| Proposed Agrovoc |
Holstein herd;
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| Publication Type |
Journal
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