Advancement of puberty in male and female sheep
A brief introduction Sheep and goat production are important economic, environmental, and sociological issues for Mediterranean countries. Milk production in particular is an integral part of the livestock sector. I
n this review, we point out that the wide variety of breeds, flock management, milking systems, and lamb weaning practices present in the dairy sheep sector of the Mediterranean countries result in a wide range of production systems.
It is true that milk production in sheep can be affected by a variety of factors other than breeds, such as nutrition, type of lambing, or weaning. Milk secretion is directly affected by the number of lambs suckling their dams. During lactation, meat sheep breeds with multiple births produce more milk.
A study has found that ewes whose mothers rear more than one lamb produce more milk than ewes who rear only one lamb, but this effect is only noticeable during early lactation when lambs are still with their mothers and suckling affects milk production.
The sex of the offspring affects milk production.
Limited literature is available regarding the impact of lamb number and gender on sheep dam’s milk production. Few studies have demonstrated that offspring gender does not affect milk production in meat breeds.
Breeds such as the Lacaune and Assaf, which produce a lot of milk, do not let their lambs suckle their mothers. Instead, they are given colostrum and artificially raised just after lambing to stimulate milk production.
The suckling period of lambs is around one month, followed by up to two months of milking, as found in Spanish, Italian, and Greek dairy breeds, such as the Latxa, Churra, or Sarda. In this study, the aim was to determine whether artificially reared lambs or lambs raised naturally, affected milk production in their mothers. Phenotypic characteristics
There are two types of Huang-huai sheep: those with a black head and those with a white head. Specifically, the hair and skin around the anus and vulva are black, the hair and skin on the body are white, and the hair and skin on the head are black. Hua-huai sheep have a white coat and skin over their entire body, without any variations.
A Huang-huai sheep has an appealing face with an uplifted nose bridge, medium-sized, slightly drooping ears, and a good head and neck combination. A ram’s neck is stubby, while a ewe’s neck is slender.
The chest is broad and deep, the back is straight, the waist is flat, and the hindquarters are plump, showing a double rump. Four limbs are long and strong, the hoof is solid, the body is round and barrel-shaped, and rams and ewes have thin tails and no horns.
Shepherds of Huang-huai sheep can be easily managed and adjusted to the scale of feeding or breeding. The Huang-huai sheep’s genetic evaluation was formed through conventional breeding and marker-assisted selection.
This system combines intensive large-scale breeding with an industrial technology system to develop Huang-huai sheep, combining large-scale livestock enterprises, breeders, and farmers.
Supporting livestock enterprises will enable farmers to overcome poverty and develop a rural economy. Improved performance, carcass quality, reproduction rate, and economic and social implications have been associated with the breed of sheep.
The breed will contribute significantly to the development of the modern mutton sheep industry, which is important both for the market and for social development. The presence of female lambs had a positive effect on milk yield in both cases, especially when both the male and female lambs were born together.
These results support our previous work and offer new opportunities to increase the profitability of dairy sheep farms by selecting the offspring gender, which is possible with sexed semen.
Genetic evaluation programs should consider the sex of the lamb as a potential source of variation when determining a genetic index since it can influence the milk production of an animal.
Lamb male sexual maturation is a gradual process that begins in utero and involves a complex interaction between the hypothalamus, anterior pituitary, and the gonads. There is a considerable variation between and within breeds of sheep in the age and the weight at puberty that is due to both genetic and environmental factors, particularly nutrition for both sexes and photoperiod for the female.
By raising the plane of nutrition during rearing, puberty can, for example, be substantially advanced due to the close association between general body growth and sexual development. The scientific literature indicates that certain improvements can be made in the reproductive performance of both ewes and ram lambs.
Moreover, early breeding is increasingly regarded as an effective method for improving flock productivity under a variety of conditions.