Due to improper feeding and management, genital tract inflammation, stress and so on, the reproductive system function is abnormal, hormone secretion disorders in the body cause damage to the reproductive function of cows, often occur persistent corpus luteum, ovarian cysts, ovarian quiescence and so on.
NO.1 Persistent corpus luteum
Female cows are not fertilized after delivery or ovulation. The corpus luteum on the ovary exists for 25 to 30 days without disappearing, which is called persistent corpus luteum.
1. Symptom: Dairy cows stop the estrus cycle and do not estrus for a long time. During the rectal examination, one side of the ovary may be enlarged and hard. If no estrus occurs beyond the time it should be estrus, a rectal examination should be conducted again every 5 to 7 days. The size, location, and hardness of the corpus luteum remain unchanged, which can be determined as persistent corpus luteum.
2. Prevention and treatment: adjust the diet according to the specific situation and strengthen the exercise. It can be intramuscularly injected with 0.4-0.6 mg of cloprostenol, which should be treated simultaneously when accompanied by uterine inflammation.
NO.2 Oophoritic cyst
There are two forms of ovarian cyst: one is a follicular cyst, which is formed by degeneration of developing follicular epithelium, thickening of follicular wall connective tissue, death of egg cells and increase of follicular fluid; the other is luteal cyst, which is caused by luteinization of Unovulated follicular wall epithelium, or luteinization after ovulation due to some reasons. Insufficient, in the luteal body to form a cavity and accumulate liquid and form.
1. Symptoms: follicular cysts are characterized by irregular oestrus, long duration, edema of the vagina, follicle diameter generally greater than 2.5 cm, and no ovulation for at least 7 days; luteal cysts are characterized by cessation of sexual cycle and no oestrus. Ovarian cysts are usually caused by mineral and vitamin deficiency in feed, anterior pituitary dysfunction, high use of estrogen and equine chorionic gonadotropin, etc., and also secondary to other genital tract inflammation. Excessive proportion of concentrate in diet can also cause follicular cysts.
2. Prevention and treatment: intramuscular injection of LRH-A3 (luteinizing hormone-releasing hormone) 50 micrograms for 3 days, or intravenous injection of 20,000 international units of HCG (human chorionic gonadotropin), or direct follicular puncture, immediately after follicular fluid discharge, into the ovary LH200 international units; or intramuscular injection of progesterone 250 milligrams each time. G, once a day for 7 days; 0.6 mg cloprostenol was injected directly into the corpus luteum cyst. Cattle breeders should pay more attention to cows, if there is uterine inflammation, it should be treated at the same time.
NO.3 Ovarian motility
1. Symptoms: Dairy cattle do not have estrus, touches their ovaries in normal size and texture, but there are no obvious follicles, and no obvious corpus luteum; some ovaries are hard and slightly smaller, and rectal examination after 7 to 10 days, the ovaries are still unchanged.
2. Prevention and treatment: Ovarian restlessness usually occurs in lean cattle with high yield, or in inadequate feed, single and poor quality, and in the absence of some essential trace elements or nutrition facts. HCG (human chorionic gonadotropin) 2000 international units can be injected intramuscularly for 3 to 4 days, or progesterone 250 mg once a day for 7 to 10 days, or progesterone 100 mg for injection for 2 days, or progesterone vaginal sustained release 1 root for vaginal delivery. After 8 days of the rectal examination, cattle that did not return to normal were used again. When there are more cattle with ovarian quiescence, it is necessary to adjust the diet formulation in time, strengthen feeding management and increase exercise.