ABSTRACT
The goal of this study was to estimate (co) variance components and genetic parameters for pre- and post-weaning growth traits in Dagliç sheep, considering the direct additive genetic, maternal genetic, and maternal permanent environmental effects, with different statistical models. The information of 21,735 native Dagliç lambs born between 2011 and 2021 was used to estimate (co) variance components by the Average Information-Restricted Maximum Likelihood algorithm. The results showed that the most suitable model was Model 3 for birth weight (BW), average daily gain (ADG), and weaning weight (WW). Model 4 was the most appropriate for weight at three (W3), weight at six (W6), and weight at twelve months of age (W12). The direct heritabilities for BW, W3, ADG, WW, W6, and W12 were 0.35 ± 0.02, 0.36 ± 0.03, 0.27 ± 0.02, 0.22 ± 0.02, 0.47 ± 0.05, and 0.47 ± 0.05, respectively. Genetic and phenotypic correlations amongst the traits were in the range of 0.103 ± 0.008 to 0.995 ± 0.002. These results can be used for the improvement of growth traits in the Dagliç breed of sheep through selection.
ABSTRACT
The aim of the study was to evaluate the growth, body and ultrasonic measurements and some carcass traits of purebred Ramliç, Texel and crossbred (87.5â¯% Ramliç and 12.5â¯% Texel) lambs in a marker-assisted introgression (MAI) project. The effects of some environmental factors such as genotype, sex, birth type, dam age, weaning age, and birth weight on growth, ultrasound measurements, and carcass traits were significant ( P < 0.05 ). There were no significant differences between pure Ramliç and its myostatin carrier ( + / - ) and non-carrier ( - / - ) second backcrosses (BC 2 ) for birth weight, daily live weight gain, and weaning weight. The BC 2 genotype ( + / - ) was statistically caught up with pure Ramliç for wither height, body length, and rump width. Differences in the longissimus muscle depth indicated that the BC 2 ( + / - ) genotypes tended to be better for both pure Ramliç and Texel lambs. Texel lambs were superior to Ramliç in the aspect of some carcass characteristics such as leg length, cold right-half carcass weight, foreleg weight in the left-half carcass, and muscle weight in the left leg. BC 2 ( + / - ) lambs were in the middle of both breeds for the traits. BC 2 lambs carrying myostatin did not vary from Ramliç morphologically. The new type of Ramliç was also closer to Texel in the aspect of carcass characteristics. In this connection, improvement of indigenous breeds could be achieved by MAI without changing the essential characteristics. For the summary, please visit http://www.mustafatekerli.com (last access: 14 June 2022).
ABSTRACT
This study was carried out to determine the presence of polymorphisms in genes affecting litter size. The SNPs in bone morphogenetic protein receptor type 1B (BMPR1B), bone morphogenetic protein 15 (BMP15), and growth differentiation factor 9 (GDF9) genes were detected in 60 uniparous and 60 multiparous ewes from Ramliç and Dagliç breeds. The ewes are maintained in nine public herds at the breeding station of the Afyonkarahisar Sheep and Goats Breeders' Association and lambed in two consecutive breeding seasons. PCR and DNA sequencing analyses were conducted, and 36, 4, and 11 SNPs in Ramliç and 40, 3, and 11 SNPs in Dagliç were detected in BMPR1B, BMP15, and GDF9 genes, respectively. A total of 16 SNPs in Ramliç and 10 SNPs in Dagliç breeds for three genes were found to be significant ( P < 0.05 ). The resulting analyses showed that four SNPs (g.49496G>A, c.1658A>C, c.2037C>T, c.2053C>T) of the BMPR1B gene and one deletion mutation (c.28_30delCTT) in the BMP15 gene of the Ramliç breed as well as five SNPs (c.1487C>A, c.2492C>T, c.2523G>A, c.2880A>G, and c.2763G>A) of the BMPR1B gene of the Dagliç breed have significant positive regression coefficients in the desired direction of the rare allele. The observed mutations have potential to be used as genetic markers in the selection of prolific animals for both breeds.
