Research And Application Of Proportional Lactation Related Technology In Milk Goat(Ⅰ)

With the development of the social economy, the improvement of Chinese people’s living standard and the need for fresh goat milk of some special populations, how to solve the milk supply problems of the urban and rural residents and the dairy industry is the urgent problem that should be solved. This research carried out estrus synchronization or induced estrous on test flock every 2 months from every August to the next February to achieve installment breeding and milk production from milking goats and proportional lactation of the whole flock all the year round. We tested mmune globulin of colostrum and milk composition of mature milk of milking goats in different seasons to ensure that the milk quality reached the standard and to provide basic information for arranging daily diet supplies and feeding model. Then we monitored growth and development of lambs born in different seasons to ensure the normal growth and development of the lambs and establish the foundation of different cultivating measures for lambs born in different seasons. We plan to establish proportional lactation related technology system year-round in milk goat and put it into production and practice of milk goat.The results are as follows:(1) Installment breeding of milk goat. The flock were divided into four batches to carry out induced estrous or estrus synchronization in August, October, December and the next February. Results showed that estrous rate was 93.75%, 93.62%, 73.33% and 47.62%, respectively; the first two batches used NRID + PMSG(FSH) + PG method, and achieved higher estrous rate; the following two batches used a method that was a simultaneous injection of cloprostenol and FSH and got lower estrous rate; especially the estrus rate of the fourth batch was quite low, one of the reasons is that February was anestrus season, another reason is that the ewes were left over by the first two batches and were likely to suffer from the legacy of ovarian cysts and other obstacles of reproduction disease. Overall pregnancy rates of the first three batches were 43.90%, 64.29% and 60.00%, and the fourth batch of ewes will lamb in July. The first batch of the total pregnancy rate was lower than the second and the third batch of the total pregnancy rate, and this mainly because August was the summer season, resulting in improper rams heat stress, as well as the rams were suffer with mismanagement and improper feeding in the farm, both of which led to the poor quality of rams and low sperm motility, so the pregnancy rates were also low. According to the above results, the batch measures are feasible, and the choice of method for estrus synchronization or induced estrus and artificial insemination should not only consider the season and the individual cases, but also combine with the production practice to select applications.(2) Detection of milk composition. Milk of day 7, 9, 30 and 60 were collected from the ewes breed in August and lambed in the next January and those breed in October and lambed in the next March. The milk protein, milk fat, total fat solids, lactose and other major milk were tested. Results showed no significant difference between these two groups(P>0.05). The percentage of the main milk components was in the normal range, and the milk quality was up to the standard.(3) Cultivating of milk goat lambs. By ADG data analysis, the lambs growth pattern of body weight from birth to day 45 showed no significant difference(P<0.05).Results showed milk replacer was feasible, and there was no influence on the growth and development of the lambs. Lambs growth monitoring is a means of monitoring in lamb nurture. We can offer constructive guidance for lamb feeding and management recommendations according to lamb growth monitoring.