Lamb meat is tender, delicious, rich in nutrients, and is a tonic for the winter season. Eating mutton in winter can receive the dual effect of tonic and cold protection. With the people's understanding of mutton and the increasing demand for mutton, the production and breeding of mutton sheep is particularly important. In particular, the reproductive ability of mutton sheep directly affects the development of the sheep industry. The following author mainly talk about the lack of nutrients on sheep reproductive barriers.
Carbohydrates. It is the main ingredient of animal rations. If the energy level of the diet is high before and after oestrus, the ovulation rate can be increased, and there is no adverse effect on the survival of embryos during early pregnancy. However, if the ewes gain too much weight or consume too much energy, the interval between the conceptions will be prolonged. In order to improve reproductive performance, postpartum ewes should be provided with higher energy to avoid excessive weight loss, but the intake of energy should be gradually increased, otherwise it will cause obesity.
protein. Lack of protein can cause premature ovulation delay in ewes, prolonged empty period. Protein levels are too high and have negative effects on fertility. In addition, feeding high-protein diets to increase the level of ammonia in the rumen will have a toxic effect on the embryos and may have other adverse effects on fertility.
Vitamins. There are three main sources of vitamins for sheep: one is to ingest the diet, the second is to synthesize various vitamins, and the third is to synthesize vitamins from rumen microbes. Causes of vitamin deficiency: First, due to the long storage time of the feed, the vitamins are lost, and the second is long-term feeding or long-term stress of the sheep, so that the synthesis of vitamins reduced. For example, vitamin A is essential for the normal development of animal epithelial cells. If it is lacking, it will affect fecundity to some extent. It is mainly manifested in delayed puberty of male and female sheep, miscarriage or less production of ewes, and newborn lambs. Blindness or ataxia, no placebo, high incidence, placental keratinization, increased incidence of metritis, reduced libido sensation, testicular atrophy, reduced sperm count in delicate tubules, and decreased ovarian function in ewe For β-carotene, it was found that in the absence of β-carotene and adequate vitamin A can cause hepatic ketone content decreased, delayed ovulation, reduced estrus intensity, ovarian cysts, increased incidence, delayed uterine involution, postpartum ovarian recovery Prolonged functioning time, early embryonic mortality; vitamin D deficiency can easily cause estrus delayed; vitamin E and selenium are important antioxidants, but its role in reproduction is still unknown. It has been reported that vitamin E deficiency can cause Lamb congenital malformations.
Mineral lack or imbalance. This situation can cause sheep infertility. Calcium indirectly affects reproduction. Phosphorus participates in energy metabolism and the development of bones and milk production, and therefore has a close relationship with reproduction. The lack of selenium mainly causes a decrease in fertility. Iodine is involved in the synthesis of thyroxine and therefore affects the reproduction of sheep through synthesis of thyroxine.
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