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A study on production and reproduction traits of Friesian cattle in Egypt
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Abstract: A total of 1834 lactation records of Holstein cows were used for studying the random effects of sire and cow within sire and the fixed effects of year of calving, month of calving and parity on 305 day milk yield (305-dMY), lactation period (LP), dry period (DP), days open (00), number of service per concGption (NSPC) and calving interval (CI).
Least squares cmalysis of variance showed signIficant effect of sire on 30E.
dMY only (P<0.01), while effect or cow within sire was significant (P<0.01) on ad productive and reproductive traits studied. The effect of fixed factors were mostly significant (P<0.05) & (P<0.01).
The partial linear regression coefficients of DO and DP on 305-dMY were 11.31:1:0.5 kg/d (P<0.0l) and -10.93±0.83 kg/d (PHeritabiiity estimates were moderate for 305-dMY and LP (0.33 and 0.19 respectively) and extremelly low for DP, DO, CI and NSPC (0.02.0.01.0.02 and 0.01), respectively. Most estimates of genetic correlation were nearly similar to the corresponding estimates of phenotypic correlation in values having the same direction.
Keywords: Friesian cattle, Production and rcprodution traits, genetic and non genetic factors.
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| Publication year |
2002
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| Pages |
7281-7289
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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 |
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| City |
المنصورة
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| serial title |
Journal of Agricultural Science Mansoura University
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| ISSN |
1110-0346
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Reproduction
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AGROVOC
TERMS |
Cattle.
Cows.
Production.
Reproduction.
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| Proposed Agrovoc |
genetic factor;non genetic factor;
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| Publication Type |
Journal
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