| Titles |
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English :
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Estimation of crossbreeding components for some lifetime traits in up-grading trials of Domiati cattle with three dairy breeds in Egypt
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Arabic :
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تقدير قيم مكونات الخلط الوراثية لبعض صفات الحياة الانتاجية في تجارب تدريج الابقار الدمياطى مع ثلاث سلالات ماشية لبن في مصر
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| Abstract |
Lifetime traits in three up- grading trials of local Domiati with Friesian (Friesian trial) , Shorthorn (Shorthorn trial) and jersey (jersey trial) were genetically evaluated. Direct (G1 ) and maternal (GM) additive effect (H1) and maternal (HM) heterotic effects and direct (R1) and maternal (RM) recombination effects for total kilograms born (TKB), number of calvings (NC), herd life (HL), length of productive life (LPL), TKB/HL and TKB/LPL were estimated. In Friesian and Shorthorn trials, upgrades generally showed the highest means for TKB, NC, HL and LPL relative to the two parental purebreds, but in Jersey trial, upgrades showed higher means than local Domiati only. In Friesian trial. TKB/LPL and TKB/HL decreased with the increase of Friesian genes, while, no clear trend was detected for the same traits in Shorthorn and Jersey trials. In the three trials estimates of G1 for all life time traits were generally in favour of the European breeds, except for TKB/LPL. In Friesian and Jersey trials, estimates of GM were negative and in favour of the European breeds, while the estimates recorded in Shorthorn trial were positive and in favour of local Doiati. Estimates of H1 recorded for all trials in Friesian and Shorthorn trials were positive, while the estimates recorded in Jersey trial were negative. In Friesian trial, estimates of H1 were 43.2% for TKB, 36.8% for NC, 8.7% for HL, 17.7% for LPL, 43.3% for TKB/HL and 19.3% for TKB/LPL, while they were 21.3%, 18.99%, 13.6%, 21.8%, 14.1% and 0.79% in the Shorthorn trial in the same order. Estimates of HM in the three trials were positive and ranged from 2.1% to 44.1%. Estimates of R1 were also positive in the three trials, while those of RM were positive in Friesian trial and negative in Shorthorn and Jersey trials.
Keywords: Egyptian Domiati cows, up-grading, lifetime traits, Additive, heterotic and recombination effects.
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| Publication year |
2001
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| Pages |
1-14
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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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| ISSN |
0302-4520
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| Author(s) from ARC |
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| External authors (outside ARC) |
عزت عطا عفيفى
جامعة الزقازيق
ماهر حسب النبى خليل
جامعة الزقازيق
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| Agris Categories |
Animal husbandry
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AGROVOC
TERMS |
Additives.
Cows.
Recombination.
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| Proposed Agrovoc |
recombination effects;heterotic;lifetime traits;up-grading;Egyptian Domiati cows;
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| Publication Type |
Journal
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