The major histocompatibility complex (MHC) plays a central role in the control of disease resistance and immune response. Extensive genetic diversity in MHC genes provides a valuable source for genetic improvement, via selection, in many domestic animals. Exon 2 of the class II MHC, termed Ovar-DRB1 in domestic sheep (Ovis aries), has been suggested as important disease resistance and immune re...

fertility rate is an economically important trait in sheep, which is influenced by genetic and environment. so far, three genes have been identified that affects this trait, one of them would be the bmp family, the most famous one is bmp15. different mutations in the bmp15 gene, increases reproductive performance and growth rate in sheep. the aim of this study was to investigate the genetic and...

The aim of this study was to describe inbreeding and population structure in Sangsari sheep breeding station. For this reason, data from 7028 Sangsari sheep which were collected during 1987-2014 in Sangsari sheep breeding station located near to Damghan city, Semnan province were used. Lambs born during 2010-2014 were considered as reference population. The genetic structure analysis of the pop...

the major histocompatibility complex (mhc) plays a central role in the control of disease resistance and immune response. extensive genetic diversity in mhc genes provides a valuable source for genetic improvement, via selection, in many domestic animals. exon 2 of the class ii mhc, termed ovar-drb1 in domestic sheep (ovis aries), has been suggested as important disease resistance and immune re...

to assess hard ticks population on sangsari sheep breed under the effect of weather’s parameters such as duration of sun shine, humidity, ambient temperature, altitude, 5% of a flock (almost 1000 sheep in mountains and fields of semnan and tehran provinces) were randomly separated and were observed monthly. during a year, a total of 1505 hard ticks (635 females and 870 males) containing dermace...

introduction small ruminants, especially native breed types, play an important role in livelihoods of a considerable part of human population in the tropics from socio-economic aspects. therefore, integrated attempt in terms of management and genetic improvement to enhance production is of crucial importance. knowledge of genetic variation and co-variation among traits is required for both the ...

Abstract Farm diversification is mainly driven by risk mitigation effects and economic gains related to complementarities between production activities. By combining these two aspects, we investigate economies in a sample of French mixed sheep farming systems rank using stochastic dominance criteria. Partially diversified (Sheep-Grass, Sheep-Crop, Sheep-Landless) fully (Sheep-Grass-Crop-Landles...

Factors affecting ewe prolificacy (number of lambs born per ewe lambing) were evaluated using records on 9705 Targhee, 12,721 Suffolk, and 7231 Polypay lambings from flocks participating in the US National Sheep Improvement Program. Factors considered were ewe age and season of lambing. Prolificacy was affected by age of the ewe (P<0.001) and was highest for ewes lambing between 4 and either 7 ...