Abstract: The disclosure discloses a composition containing melatonin as an effective ingredient, and its application in improving DHI production performance and improving milk quality. The composition containing melatonin as an effective ingredient according to the present disclosure can significantly reduce the somatic cell count in milk and improve milk quality. Under the conditions of different seasons, ages, and lactation periods, the administration of the composition containing melatonin as an active ingredient according to the present disclosure can significantly reduce the somatic cell score of cow milk (p<0.01), increase the protein content and lactose content in milk, and meanwhile reduce the fat content and urea nitrogen content in milk. In summary, the composition containing melatonin as an effective ingredient according to the present disclosure can improve the quality of milk and increase the efficiency of dairy cow breeding.

Abstract: Disclosed is a composition for increasing pregnancy rate in ruminants exposed to ovsynch and timed artificial insemination, and a preparation method and application thereof. The effective component of the composition is melatonin with a concentration of 10-20 mg/mL. The present disclosure proves through animal experiments that the use of the composition of the present disclosure in combination with the last injection of GnRH in an ovsynch and timed artificial insemination protocol for a ruminant can regulate the secretion of reproductive hormones in an animal body, increase the levels of luteinizing hormone (LH) and progesterone in pregnant females, and improve ovum quality and facilitate ovulation, thus increasing the pregnancy rate in ruminants exposed to ovsynch and timed artificial insemination.

Abstract: The disclosure discloses a composition containing melatonin as an effective ingredient, and its application in improving DHI production performance and improving milk quality. The composition containing melatonin as an effective ingredient according to the present disclosure can significantly reduce the somatic cell count in milk and improve milk quality. Under the conditions of different seasons, ages, and lactation periods, the administration of the composition containing melatonin as an active ingredient according to the present disclosure can significantly reduce the somatic cell score of cow milk (p<0.01), increase the protein content and lactose content in milk, and meanwhile reduce the fat content and urea nitrogen content in milk. In summary, the composition containing melatonin as an effective ingredient according to the present disclosure can improve the quality of milk and increase the efficiency of dairy cow breeding.