Kamel Fattal* (1), Abdalhady Hattaby (2) and Rama Bakry Zalat (2)
(1). Animal Production section, Aleppo Center of Scientific Agricultural Researches (ACSAR), Aleppo, Syria.
(2) Department of Animal Production, Faculty of Agriculture, University of Aleppo, Aleppo, Syria.
(*Corresponding author: Kamel Fattal. E-Mail: kamel1960@gmail.com ).
Received: 17/04/2020 Accepted: 17/06/2020
Abstract
Data were collected from an intimate research station for breeding Shami goats of the General Authority for Scientific Agricultural Research.
The total collected data reached (316) records for the studied characteristics (daily milk production test, fat percentage, protein ratio), while the animal numbers reached to (95)animals. The results showed that the value of the genotype variance of the adjective fat percentage (6.75), followed by the contrast value of the daily milk test characteristic (4.46), then the value of the protein attribute value (0.50). While the value of the permanent environmental variation of the daily milk test attribute was (1.27), followed by the value of the contrast ratio of the percentage of fat (0.79), then the value of the protein percentage attribute (0.72). Daily (0.45), then the value of the protein ratio characteristic (0.15). The phenotypic variation value for the percentage of the fat percentage (8.63), followed by the contrast value of the daily milk test characteristic (5.72), then the value of the protein ratio characteristic (1.33). Genetic equivalents reached 0.61, 0.67 , 0.28 for each of the daily milk production test characteristics, fat percentage, protein ratio, respectively. As for the genetic association, it reached 0.08, 0.65, 0.55 between the test characteristic of daily milk production and both the characteristics of the fat percentage and the protein ratio respectively, while the genetic association between the fat percentage and the protein ratio was 0.31. The range of educational (genetic) values reached from -1.42 to 1.65, -1.58 to 1.32, -0.47 to 0.42, for daily milk production test qualities, fat percentage, protein ratio, respectively. Trust level coefficients ranged between 0.40 and 0.93. The range of permanent environmental values ranged from -0.46 to 0.51, -0.73 to 0.98, -0.77 to 0.91 for the daily milk production test qualities, fat percentage, protein ratio, respectively. The rank correlations between educational (genetic) values were -0.38, 0.69 , 0.55 for the daily milk production attribute and for the fat and protein ratios respectively, while the correlation between the levels between the educational (genetic) values of the fat ratio and the protein ratio attribute was 0.43. We conclude from the research the possibility of improving the quality of the test of total milk production, and this will improve the quality of the protein ratio in milk genetically. We also recommend the selection of animals, especially males, on the basis of the high educational value (genetic), taking into account the high degree of confidence when estimating the educational value (genetic). And that increasing the fat percentage in the milk will lead to an improvement in the structural structure of the cheese made from this milk. The increase in the percentage of protein in milk will increase the ratio of converting the amount of milk into cheese.
Key words: Shami goats, Test day milk yield, Fat%, Protein%, Syria.
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