EFFECT OF WEANING AGE ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE AND BIOLOGICAL PRODUCTIVITY INDICES OF DOE KIDS | ||||
| Journal of Animal and Poultry Production | ||||
| Article 2, Volume 31, Issue 10, October 2006, Page 6187-6193 PDF (85.57 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2006.235623 | ||||
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| Authors | ||||
| M. M. Abdelsalam,1; M. Eissa2 | ||||
| 1Animal Production Dept., Faculty of Agric.. Alexandria University | ||||
| 2Animal Production Research Institute. Agricultural Research Center, Ministry of Agriculture. Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| The present study was carried out on 1172 records of Damascus (D), Barki (B) and DB cross female kids reared at Borg El-Arab Experimental Farm over 22 years to estimate the effect of weaning age of female kids (8, 12 and 16 weeks) on its productive and reproductive traits and biological productivity indices (I1 : weight of weaned kid produced per doe per year, kg; I; : weight of kid per kg post partum weight of doe per year; I3 : weight of kid per kg metabolic post partum weight of doe per year; I. : additional kid weight producedldam per year; kg; I5: additional kid weight produced} kg live weight of dam per year and la: additional kid weight producedlmetabolic weight of dam per year). The results indicated that female kids that weaned at 12 weeks of age had the highest number of kids born or weaned, the longest lifetime and the longest days in milk. The heaviest total weight of born or weaned kids was produced from female weaned either at 12 weeks (for Barki and Damascus) or at 16 weeks (for the DB). The highest milk conversion ratio (gain per one kilogram suckled milk) was observed in kids produced by doe that weaned at 16 weeks in Barki and crossbred while for Damascus was found in kids from does weaned at 12 weeks. In Barki, weaning age had significant effect on total kilograms born and lifetime length as well as values of l1, lg, I3 and I5 indices. In Damascus, weaning age had significant effect on total kilograms weaned, total milk yield, days in milk, milk conversion ratio as well as values of l1 and I4 indices. In DB genotype, weaning age had highly significant effect on total milk yield and milk conversion ratio as well as all productive indices. Damascus breed showed higher lifetime production traits followed by the DB while the Barki was the poorest in productivity. Breed had significant effect on all productive indices. | ||||
| Keywords | ||||
| Goats; Lifetime production traits; productivity indices | ||||
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