| Titles |
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English :
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Genetic and phenotypic parameters of milk yield and reproductive performance in the first three lactations of Egyptian buffalo
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Arabic :
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المعايير الوراثية و المظهرية لانتاج اللبن و الاداء التناسلى في المواسم الثلاثة الاولى للجاموس المصرى
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| Abstract |
The objective of this work was to investigate early selection based on the first lactation to improve milk yield in the first three lactations. A total of 1911 lactation records each for milk yield, lactation length, age at first calving and average interval between successive calvings, representing 637 buffalo cows, daughters of 123 sires and 519 dams, were analyzed by fitting a multiple-trait animal model using REML procedure. The model included herd and year-season of birth as fixed effects and animal as random effect. The results revealed that the fixed effect of herd contributed significantly to variation in all studied traits except for age at first calving, while year-season of birth significantly affected milk per day/lactation, first lactation length, age at first calving and average interval between successive calvings. Heritability estimates for milk yield, cumulative milk yield, milk per day/lactation and first lactation length varied from 0.13 to 0.27. Heritability estimates for age at first calving and average interval between successive calvings were 0.11 and 0.07, respectively. Genetic and phenotypic correlations were high and positive for milk yield, cumulative milk yield, milk per dayl1actation and first lactation length. While, it was moderate to low for these traits with both age at first calving and average interval between successive calvings. Results indicated that early genetic selection of milk yield for the first three lactations based on the first one is possible through a selection scheme in the Egyptian buffalo.
Keywords: Improve milk yield, a multiple-trait animal model, a selection scheme
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| Publication year |
2011
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| Pages |
1-10
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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 of Animal Production
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| Author(s) from ARC |
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| Agris Categories |
Animal husbandry
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AGROVOC
TERMS |
Animal models.
Genetic parameters.
Milk yield.
Phenotypes.
Reproductive performance.
Water buffaloes.
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| Proposed Agrovoc |
a multiple-trait animal;selection scheme;
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| Publication Type |
Journal
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