Controlling the time of estrus facilitates several management goals. It is desirable to have females in estrus at certain times to provide maximum use of intensive pork production facilities, to schedule breeding of mares to stallions, and as a part of artificial insemination (AI) programs. The general approaches for all species are outlined elsewhere in this encyclopedia. These are: 1) lysing the corpus luteum or corpora lutea (CL); 2) artificially extending the luteal phase by administering a progestin; 3) inducing follicle growth and ovulation using gonadotropins; or 4) using combination protocols. However, differences in the reproductive physiology of the various livestock species require unique estrus-synchronization protocols for each species. Furthermore, before animals are treated, the regulations governing use of each drug in the country or jurisdiction should be determined.

Pregnancy Nutrition

Pregnancy Nutrition

Are You Expecting? Find Out Everything You Need to Know About Pregnancy and Nutrition Without Having to Buy a Dictionary. This book is among the first books to be written with the expertise of a medical expert and from the viewpoint of the average, everyday, ordinary,

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