Multiparous Suffolk and Suffolk-cross ewes were randomly allotted to treatments within breed and year to measure effects of ram exposure, during transition from anestrus to breeding activity, on reproductive performance. Treatments were: 1) ewes joined with two mature vasectomized Rambouillet rams for 15 d before breeding (DC), 2) ewes maintained across a net wire fence from two vasectomized ra...

The differences of fertility and prolificacy traits for Rahmani and Chios ewes were studied in this investigation. The study was conducted during two consecutive years that included three lambing season with a total of 273 ewes (162 Rahmani and 111 Chios) bred, 230 ewes lambing, 280 lambs born and 237 lambs weaned. Breed of ewes had a significant effect on fecundity, lambing rate and weaning ra...

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...

Increased fecundity and improved feed management have doubled the number of lambs born in any threeday period spring since 1990. Four farmer catchment groups were engaged to investigate options that farmers may use reduce impacts weather at lambingtime. After workshops identified potential mitigations, a lamb survival model was developed using data from literature. This applied daily time steps...

This study evaluated the reproductive and productivity of local Dorper crossbred ewes in a community-based management system. We analyzed data collected from 2013 to 2021, taking into account different factors such as dam-breed, location, type birth, season, year lambing. Lambing was observed all year-round, but majority (35%) occurred September, October, December. suggests that pasture availab...

The aim of this study was to assess the duration and frequency behavioral observations pregnant ewes as they approached lambing. An understanding changes before birth may provide opportunities for enhanced visual monitoring at critical stage in animal’s life. Behavioral 17 late pregnancy were recorded during two separate time periods, which 4 6 weeks lambing giving birth. It normal farm procedu...

this study was carried out at sakha animal production research station, during the period from oct., 2009 to sept., 2010. forty rahmani ewes were divided into three treatment groups: the 1st, 2nd and 3rd treatment groups were intramuscularly injected (day 0) with 1 ml gnrh analogue followed by an intramuscular injection with 0.7 ml pgf2α5 (g1), 6 (g2) or 7 (g3) days later. a second dose of 1 ml...

the ovine melatonin receptor 1a (mtnr1a) and aromatase (cyp19) genes were structurally characterized and the association between their variants and reproductive and growth traits was studied in kurdi sheep at kurdi sheep breeding station located in shirvan, iran. the genomic dna was extracted by guanidine thiocyanate-silica gel method. polymerase chain reaction was carried out to amplify 824 bp...