Hadeel Obaid*(1) Hassan Emmad Al-Masri(2) Kamel Fattal(3) and Abdel Nasser Al-Omar(1)
(1). Hama Agricultural Scientific Research Center, General Commission for Scientific Agricultural Research (GCSAR), Damascus, Syria.
(2). Department of Animal Production, Faculty of Agriculture, University of Aleppo, Aleppo, Syria.
(3). Aleppo Agricultural Scientific Research Center, (GCSAR), Damascus, Syria.
(*Corresponding author: Eng. Hadeel Obaid. E-Mail: hadilobaid2017HYPERLINK “mailto:*للمراسلةkamel1960@gmail.com”@gmail.com).
Received: 04/12/2019 Accepted: 03/06/2019
Abstract
The research was carried out at Hama Research Center, General Commission for Scientific Agricultural Research (GCSAR) within 2013 and 2017, with the aim of defining milk production curve for goats and studying some of the factors affecting it. The analysis of variance was used to determine the effect of different factors, and Duncan test for comparison of averages, using SAS program (1996), and the incomplete linear gamma function was used to estimate the parameters of equation (a, b, c). The parameters of the milk production curve in Shami goats were about: 1.44 ± 0.07 kg for function a (average initial production), 0.41 ± 0.01 kg for b (increase to peak), and 0.12 ± 0.01 kg for c (drop after climax). The peak milk production (PY) and peak week TPY, Persistency, R2, Average Mean Square Error (MSE), Square Deviation (PSB) 1.58 Kg, 3.42, 85%, 0.98, 0.14 and 0.15 respectively. The genetic equivalent of coefficients a, b, c, py and Persistency were 0.18, 0.12, 0.1, 0.11 and 0.12 respectively. The coefficients for a, b, c, py and Persistency were 0.3, 0.23, 0.24, 0.12 and 0.22, respectively. Thus, it can be concluded that the incomplete gamma function was sufficient to describe the milk curve of the Shami goat.
Keywords: Milk curve, Milk production peak, Shami goats.
Full Paper in Arabic: PDF