Effect of crossing indigenous Awassi sheep breed with mutton and prolific sire breeds on the growth performance of lambs in a subtropical region
2002
Momani Shaker, M. | Sada, I. | Sovjak, R. (Ceska Zemedelska Univ., Prague (Czech Republic). Institut Tropickeho a Subtropickeho Zemedelstvi) | Abdullah, A.Y. | Kridli, R.T. | Muwalla, M.M.
The objective of this study was to evaluate the effect of crossing indigenous Awassi sheep with prolific breeds on body weight and growth ability of lambs from birth to weaning, including the effect of litter size, sex, dam age, dam weight at mating, dam weight after lambing and year of rearing. The live weight was determined in 192 lambs (70 Awassi, 63 Awassi x Charollais F1 crossbreds and 59 Awassi x Romanov F1 crossbreds) at birth and subsequently every fortnight until weaning. Average live weight of lambs at birth was 4.20+/-1.15 kg and at the age of 15, 30, 45, and 60 days 8.72+/-2.12 kg, 12.12+/-2.77 kg, 15.50+/-3.70 kg and 19.27+/-4.59 kg, respectively. Average daily weight gain (ADG) of lambs from birth until weaning was 248+/-0.07 g. Genotype of lambs and litter size affected ADG, live weight of lambs at birth, 15, 30, 45 and 60 days significantly. Investigations of the effect of sex on live weight of lambs at birth and at 60 days showed that the differences between males and females were statistically significant. Differences in ADG and live weight at 15, 30, and 45 days according to dam age were significant. Regressions of BW, ADG and weight at 15, 30, 45, and 60 days age of lambs on dam weight after lambing were significant. Live weight of lambs at birth, ADG until weaning and live weight at 15, 30, and 45 days of age were affected by the seasons of lambing.
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