the aim of this study was to investigate the effects of different metabolizable protein levels in diet during the peri parturition on performance and blood parameters of afshari ewes and lambs. thirty two once lambing ewes in the last six weeks of pregnancy and the first six weeks of lactation with diets before and after parturition containing rates of nrc recommended and 20% higher one as low ...

the fecundity in sheep has been much interested for producers due to its economical importance. growth differentiation factor 9 (gdf9) is an autosomal gene with over dominance effect for twosingle nucleotide polymorphisms(snps), which resulted in sterility in homozygote mutant ewes and additive effect for three snps, without showing sterility event. in the present study, dna was extracted from ...

introduction one of the animal breeding aims is increasing the economic efficiency. therefore, mating among selected animals in order to enhance economic efficiency should also supply variation in population for next generations’ selection. this study was performed to estimate performance in cross breed lambs resulting from crosses of shal, moghani, afshari and varamini rams with varamini ewes,...

The fecundity in sheep has been much interested for producers due to its economical importance. Growth differentiation factor 9 (GDF9) is an autosomal gene with over dominance effect for twosingle nucleotide polymorphisms(SNPs), which resulted in sterility in homozygote mutant ewes and additive effect for three SNPs, without showing sterility event. In the present study, DNA was extracted from ...

introduction one of the most important sources of the red meat in iran is the meat produced from sheep. increasing lamb per ewe considered as a strategy for improving the efficiency for sheep production, although reproduction traits have low heritability. several genes associated with reproduction were investigated in the recent years. the bmp 15 gene and its paralog gdf 9 and receptor, bmpr-ib...

Published data on the effects of ruminal bolus on the number of ovulatory follicles in ewes does not exist. The present study determined the effects of a ruminal bolus on trace element status, follicular dynamics and reproductive performance in ewes. Eighty Afshari cycling ewes were synchronized during breeding season using CIDR for 14 days and assigned to 4 groups (n=20); group 1 received a si...

a crossbreeding experiment involving four iranian fat-tailed sheep breeds, namely kurdi (k), chaal (c), afshari (a) and sanjabi (s) was carried out to determine the ram breed effects on productivity of kurdi fat-tailed ewes (k) under extensive production system. a total of 475 kurdi ewes were mated to 24 rams from four breeds producing 454 lambs including pure kurdi, kk, (116 lambs), afshari × ...

the aim of this study was to investigate the effect of reducing metabolizable protein with rumen-protected lysine and methionine in diet during the last 5 weeks of gestation on performance and blood parameters of afshari ewes and lambs. twenty five mature (once lambing) ewes in a unbalanced complete randomized design fed with diets containing low metabolizable protein but containing rumen-prote...