| Titles |
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English :
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Study on the predication of buffalo cow
transmitting ability.
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Arabic :
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دراسة عن التنبؤ بالقدرة التمريرية لإناث الجاموس.
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| Abstract |
Study on the Prediction of Buffalo Cow Transmitting Ability. Unpublished master of science, University of Ain Shams, Faculty of Agriculture, Department of Animal Production, 1996.
This work was designed to predict the buffalo cow's transmitting ability for 305 days milk yield (305-MY), lactation period (LP) and age at first calving (AFC) using an animal model. The effect of parity, month of calving, year and age at calving and the interaction between the parity and age at calving on the milk production traits were included in a fixed model to study the effect of those factors on 305_MY, LP and AFC. The study also, included the estimation of the genetic and phenotypic parameters for 305_MY, LP and AFC by REML.
A significant effect was observed for all factors on milk production traits except for the effect of interaction between age at calving and the parity on 305 MY. For the age at first calving, the effect of year of birth was significant but month of, birth did not affect this traits. Estimates of habitability were 0.15, 0.11 and 0.15 for 305_MY, LP and AFC, respectively. Genetic and phenotypic correlations were high and positive between milk production traits. While it was low and negative among age at first calving and milk production traits. The buffalo cows (with records) transmitting ability ranged from 401.12 to -2741.78 kg, for 305-MY and 53.03 to -32.02 day for LP and 2.61 to -2.22 month for AFC, respectively. Also, these values ranged from 200.57 to -160, from 27.51 to16.01 and 1.30 to -1.11 for buffalo cow's dams (without records) for 305-MY, LP and AFC traits, respectively.
The results of the regression coefficient of buffalo cow's transmitting ability on year of birth indicated that there was a negligible annual genetic improvement about 0.728 kg milk, 0.097 day lactation and -0.001 month in age at first calving. Which correspond to improvement of 10.2 kg milk, 1.36 day and 0.014 month for 305_MY, LP and AFC per generation (7.01 years), respectively.
Key words: Egyptian buffalo, Milk production, Age at first calving and
Transmitting ability.
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| Publication year |
1996
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| Pages |
115p.
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| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى- الجيزة
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| Availability number |
664
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| Organization Name |
Animal Production Research Institute (APRI)
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| Country |
Egypt
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| Department |
Buffalo Breeding Research Department
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| Author(s) from ARC |
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| Agris Categories |
Animal husbandry
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AGROVOC
TERMS |
Breeding value.
Milk production.
Parturition.
Water buffaloes.
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| Publication Type |
Master Thesis
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