Abstract:
The study was conducted to investigate the productive traits of Nubian goats by crossing with Saanen
Sixteen mature female goat and two buck purchased from El karaba area northern part of River Nile State and two Saanen buck reared by Animal Resource Directorate in River Nile state . Nannies were divided into four groups, based on live body weight, under same management. Two groups were mated with Nubian buck and other two groups mated with Saanen buck (100%) . the dams age range from 1 – 2 years old the average body weight 21± 2kg .the numbers of borne kids were sixteen( nine males and seven female). The productive performance in Nubian breed, birth weight was 2.87 ± o.15 and 3.02±o.12kg for female and male respectively. And their Saanen cross bred50% (Nubian X Saanen) were
3 .34 ±0.27 , 3.63±0.21 for corresponding sex. the study reported that males were heavier than female. The weaning weight ( 12weeks ) 10.56 ± 0.35 ,10.23 ± 0.71kg in male and female for Nubian goat respectively. And for their Saanen crossbred (50%) was 11.70 ± 0.76 kg,10.82 ± 0.65kg for male and female respectively. The Post - weaning body weight at 24 weeks of age in Nubian breed were 14.92 ± 0.67 , 14.77 ± 0.42kg,for male and female respectively. And the weight of Saanen crossbred were 16.27±0.67, 15.12 ± 0.44 kg for male and female respectively at the same age. The live body weight at( 34) weeks age( mature age), 16.60 ± 0.40, 16.4 ± 0.63kg for male and female Nubian goats respective. And that of
their Saanen crossbred were 18.30 ± 0.50, 17.04 ± 0.38kg . The growth rate in pre and post- weaning , were ,7.453 ± 0.180, 7.773 ± 0.180 kg
iv
and the 6.088 ± 0.720 , 6.362 ± 0.283kg , in Nubian goats and their Saanen crossbred 50% respectively . The overall live body gain was 13.563±0.463 , 14.063±0.593 for corresponding breed .It was highly significant( p<0.01). Also, the mean square indicates that male kids performed in all cases considerably, better than female kids.
The linear body measurements heart girth ranged between 31.3 +2.3 and 62.4 + 2.5 cm at birth (female Nubian) and at 34th week of age (male crossbred) respectively. With the exception of the effect of breed at 12th and 24th week of age, all other measures of the heart girth are significantly.
Height at wither of Saanen crossbred(50%) was higher than Nubian kids at all ages but was significantly at birth 36.4±2.2 , 33.5±2.8 (p<0.05). Males of two breeds had higher height at wither at 24th and 34th week of age than females . Nubian goats had significantly lesser body length than their Saanen crossbred at all ages. (.p<0.01, p<0.05). On the other hand the body length was not affected by the sex of the animal at all ages. The height at wither growth rate the same trend of that body weight. The regression of body weight on height at wither had highest coefficient of determination. From the result it was concluded that Nubian X Saanen crossbred (50%) perform better than pure Nubian. So crossbreeding of Nubian is recommended .Moreover has good adaptation to River Nile State environment.
