Hadil Obaid*(1) Kamel Fatal(2) Abd Al-Naser Al-Omar(3) and Emad Al-Masri(4)
(1). Hama Agricultural Research Center, General Commission for Scientific Agricultural Research (GSCAR), Damascus, Syria.
(2). Aleppo Agricultural Research Center, (GSCAR), Damascus, Syria.
(3). Animal Production Department, Faculty of Agricultural, Aleppo University, Aleppo, Syria.
(*Corresponding author: Eng. Hadil Obaid. E-Mail: hadilobaid2017@gmail.com).
Received: 10/02/2018 Accepted: 04/04/2018
Abstract
The study was conducted on Shami goat herd using milk production seasons during the period (2013-2017) at Hama Research Center, General Commission for Scientific Agricultural Research (GCSAR). A total data of 471 milking records was analyzed to study the genetic persistency of milk production of Shami goats under semi-intensive rearing system, using subtraction between genetic estimation to produce 120 days from genetic estimation to produce first 60 days of milk season.The average of milk production for the first 60 days and 120 days of the milk were (70.61±20.80) and (120.69±0.45) kg respectively. The production of the year had a significant effect on milk production at 60 days, also parity had a significant effect on milk production at 120 days of lactation period (P<0.01). while there were no significant effects of parity and kidding type on milk production at 60 days. Also, no significant effects were noticed for year production and kidding type on milk production at 120 days (P>0.05). Heritability values of milk production at 60 and 120 days were (0.18) and (0.75) respectively. The values of genetic persistence of males at 60 and 120 days reached the peak of (+40.34) and the lowest of (-39.6) kg. So, these estimates can be used to increase the economic return and improve the goat flock for milk persistency. The research concluded the possibility of improving milk persistency genetically for female Shami goat.
Keyword: Genetic persistency, Milk production, Shami goats, Heritability.
Full paper in Arabic: PDF