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    Comparison of nonlinear functions using partial growth data at different lengths of growth period in awassi lambs
    (Zoological Soc Pakistan, 2021) Tekel, Nihat; Koncagul, Seyrani; Barıtcı, İlkay; Sireli, Halit Deniz; Tutkun, Muhittin; Eyduran, Ecevit; Tariq, Mohammad Masood
    The aim of this study was to comparatively evaluate some nonlinear functions i.e. Brody, Negative Exponential and Bertalanffy in order to describe the growth of Awassi male lambs (n=120) at the age of 10 months. The coefficient of determination values estimated for Brody, Negative Exponential and Bertalanffy models were 0.9523, 0.6094, and 0.9428 R2 for the first-time interval (0-90 days of age), 0.9866, 0.9743 and 0.9797 R2 for the second time interval (0-180 days of age) and 0.9924, 0.9853 and 0.9902 R2 for the third time interval (0-300 days of age), respectively. Pearson correlation coefficients between the observed and predicted weight values of the Awassi lambs were found as 0.9417, 0.9255 and 0.9203 for 0-90 days of age, 0.9741, 0.9501 and 0.9634 for 0-180 days of age and 0.9824, 0.9765 and 0.9790, for 0-300 days of age, respectively. Brody, Negative Exponential and Bertalanffy models were found to be useful models to describe the growth of Awassi lambs raised in Turkey. In conclusion, it could be suggested that the nonlinear functions might allow breeders to achieve remarkable information in practice in terms of determining managerial problems, slaughtering age, ideal feed amounts, and the studied breed’s growth standards.
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    Determination of fattening performance and carcass characteristics of Awassi x (Romanov x Awassi) G1 hybrid male lambs
    (University of Punjab (new Campus), 2020) Tekel, Nihat; Baritci, Ilkay; Şireli, Halit Deniz; Tutkun, Muhittin; Eyduran, Ecevit; Tariq, Mohammad Masood
    The present study was conducted to investigate the fattening performance and carcass characteristics of Awassi x (Romanov x Awassi) G1 crossbred male lambs. In the study, seven male lambs whose weaning weights were almost similar were included in the experiment. The lambs were weaned at 2 months of age. They were fed with ad libitum concentrated feed and 100 g/day wheat straw was given to each animal during the fattening period of 64 days. During the fattening period, it was determined that daily live weight gains in lambs were 0.278±0.019 kg and feed conversion ratio were 4.79. The average final live weight, cold carcass weight, dressing percentage, leg ratio, foreleg ratio, tail ratio and cooling loss of lambs were found as 33.62±0.968 kg, 14.91±0.627 kg, 44.67±0.008%, 33.76±0.326%, 18.94±0.468%, 4.98±0.467% and 4.99±0.135%, respectively. In conclusion, the present results indicated that daily live weight gain, feed efficiency and valuable carcass fractions of Awassi x (Romanov x Awassi) G1 crossbred male lambs were found similar to the corresponding values of Awassi breed.