Vol. 9, Issue 1, Part R (2024)

Author(s): Osama H Shihab

Abstract: The aim of study to prediction for growth lambs after birth from milk production and composition by multiple formats for description of growth curve after birth non-linear regression in Turkish Awassi sheep for production season 2022-2023. The study was carried out the ruminant research station of the General Commit for Agricultural Research / Ministry of Agriculture (20 km west of Baghdad). The results showed a significant regression (p≤0.05) of the weaning weight of the lambs on the daily milk yield rate (kg) of 19.537 + 1.502, with a coefficient of determination of 0.21. Weight at weaning decreased significantly (p≤0.05) on the percentage of fat and non-fat solids (%) 0.466 and 0.794, and the value of (R2) was 0.13 and 0.16. The regression coefficient for the weight gain between birth and weaning of the lambs on daily milk production was significant, as its coefficient reached 0.981 kg, and the regression of the weight gain between birth and weaning on the percentage of lactose, protein, and non-fatty solids was significant, as its coefficients reached 0.285, 0.253, 0.703, respectively. Not significant on the percentage of fat. The regression coefficient of weight gain between birth and weaning of lambs on their dams daily milk production was significant (p≤0.05), as its coefficient reached 0.981 kg. The regression of weaning weight on birth weight was positive and significant, reaching 0.282 kg, with a coefficient of determination of 0.26. While the regression of the rate of weight gain from birth to weaning on birth weight was positive and highly significant, as its coefficient reached 0.307 and the coefficient of determination (R2) was 0.39, while the regression of weight at weaning (WWT) on the dams weight at birth (DWT) was not significant. The coefficient of determination (R2) for weight at weaning and weight gain from birth to weaning was 0.62 and 0.71, respectively.