Sire evaluation for milk production traits of Friesian cattle in Egypt
Abstract: A total of 970 normal lactation records of Friesian cows kept at Sakha farm, Ministry of Agriculture, Egypt during the period from 1968 to 1992 were used to estimate means, phenotypic, environmental and genetic correlations as well as heritability for TMY, 305 DMY and LP. The sire effects on milk production traits and estimates of sire transmitting abilities for TMY and 305 DMY were calculated. The results obtained could be summarized as follows:
1. The actual means of TMY, 305 DMY and LP were 4467, 3623 kg and 409 day, respectively.
2. Year of calving had highly significant effects (P< 0.01) on TMY and 305 DMY and significant (P< 0.05) on LP.
3. Month of calving had highly significant effect (P< 0.01) on TMY and significant effect (P< 0.05) on LP, but non significant on 305 DMY.
4. Sire had highly significant (P< 0.01) effects on TMY and 305 DMY, but non significant on LP.
5. Heritability (h2 ± SE) for TMY, 305 DMY and LP were 0.45±0.11, 0.54±0.12 and 0.09±0.08, respectively.
6. Phenotypic correlations between TMY, 305 DMY and LP were positive and highly significant (P< 0.01) (0.70 and 0.69) and the corresponding value between 305 DMY and LP (0.15) was positive and highly significant (P<0.01). Values of the environmental correlations between traits under study were positive and highly significant (P< 0.01). All genetic correlations between milk production traits were positive and highly significant (P<0.01), and the values of genetic correlations between TMY with each of 305 DMY and LP were 0.99±0.05 and 0.67±0.24, respectively, the corresponding value between 305 DMY and LP was 0.62±0.39.
7. Estimates of transmitting ability ranged from -849 to 1220 kg for TMY and -468 to 956 kg for 305 DMY, additionally, the 50 percent of sire showed positive (BLUP) for the TMY and 305 DMY.
8. Rank correlations among expected values of sires for TMY and 305 DMY was 0.99.
Publication year 2004
Pages 5539-5548
Availability location معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى- الجيزة
Availability number
Organization Name
City المنصورة
serial title Journal of Agricultural Science Mansoura University
ISSN 1110-0346
Author(s) from ARC
Agris Categories Animal husbandry
AGROVOC
TERMS		 Egypt. Environment. Heritability. Milk production. Sire evaluation.
Proposed Agrovoc Friesian cattle;phenotypic;genetic correlations;Year of calving;
Publication Type Journal
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