Effects Of Behavior Indicators Of Pre-perinatal Cows On Health Status And Production Performance Of Cows And Calves

In this thesis,the behavior indexes of 1500 pre-perinatal cows were collected by intelligent collar,and the data of postpartum health and production performance of these cows,the health status and growth and development of the calves were collected.The effects of prenatal behavior indexes on postpartum health and production performance of cows and health and growth and development of calves were studied by multiple comparison and regression analysis,which provided reference for intelligent breeding.The details are as follows:1.The effects of pre-perinatal feeding time on the health status and growth performance of cows and calves.The feeding time of 1500 cows in the early perinatal period and the data of cow delivery score,postpartum health score,peak milk yield,birth weight of offspring calves,disease score of calves during lactation and daily weight gain of calves during lactation were collected through intelligent collars.The following results were obtained:(1)The effect of feeding time on the health status and production performance of cows: The effect of feeding time on the delivery score and postpartum disease score was in accordance with the quadratic curve relationship(P<0.05).The effect of pre-perinatal feeding time on peak milk yield was in line with linear and quadratic relationships(P<0.05).(2)Effects of feeding time on health status and production performance of calves:The effects of feeding time on birth weight and daily gain of calves during lactation were linear and quadratic(P<0.05).The effect of pre-perinatal cattle feeding time on calf lactating diseases was in accordance with the quadratic curve relationship(P<0.05).(3)Based on the best points of each index of cows and calves and the fluctuation trend of feeding time of 21 days before delivery of different indexes,it is concluded that the recommended best feeding time range of perinatal cows is 120-150min/d;the recommended range of fluctuation 21 days before delivery is less than 45 min,and early warning should be made in advance if the fluctuation exceeds this range.2.The effects of pre-perinatal ruminant time on the health status and growth performance of cows and calvesThe rumination time of 1500 cows in the early perinatal period and the data of cow delivery score,postpartum disease score,peak milk yield,calf birth weight,calf lactating disease score and calf daily weight gain were collected through intelligent collars.The following results were obtained:(1)Effects of rumination time on health status and production performance of cows:The effects of rumination time on the delivery score,postpartum disease score and peak milk yield of cows in the early perinatal period were in line with linear and quadratic curves(P<0.05).(2)The effect of rumination time on the health status and production performance of calves: The effect of rumination time on the daily weight gain of calves during lactation was quadratic(P<0.05).The effect of pre-perinatal ruminant time on the lactation disease score of calves was in line with linear and quadratic relationships(P<0.05).(3)Based on the best points of each index of cows and calves and the fluctuation trend of rumination time of 21 days before delivery of different indexes,it is concluded that the recommended best rumination time range for perinatal cows is 430-510min/d;the recommended range of fluctuation 21 days before delivery is less than 90 min,and early warning should be made in advance if the fluctuation exceeds this range.3.Effects of pre-perinatal cow rest time on health status and growth performance of cows and calvesThe rest time of 1500 cows in the early perinatal period and the data of cow delivery score,postpartum disease score,peak milk yield,calf birth weight,calf lactation disease score and calf daily weight gain were collected through intelligent collars.Multiple comparison and regression analysis were used.The following results were obtained:(1)Effect of rest time on health status and production performance of cows: The effect of rest time on delivery score in the early perinatal period was in accordance with the quadratic curve relationship(P<0.05).The effect of pre-perinatal rest time on peak milk yield was in line with linear and quadratic relationships(P< 0.05).(2)Effect of rest time on health status and production performance of calves: The effect of pre-perinatal cow rest time on calf birth weight and calf lactation disease score conformed to linear and quadratic curve relationship(P<0.05).The effect of pre-perinatal cow rest time on the daily weight gain of calves was in accordance with the quadratic curve relationship(P<0.05).(3)Based on the best points of each index of cows and calves and the fluctuation trend of rest time of 21 days before delivery of different indexes,it is concluded that the recommended best rest range of cows in the early perinatal period is 750-800min/d.The recommended range of fluctuation in the first 21 days is less than 100 min,and early warning should be made in advance if the fluctuation exceeds this range.4.Effects of pre-perinatal cow bovine activity on health status and growth performance of cows and calvesThe activity of 1500 cows in the early perinatal period and the data of cow delivery score,postpartum disease score,peak milk yield,calf birth weight,calf lactation disease score and calf daily weight gain were collected through intelligent collars.Statistical methods such as multiple comparison and regression analysis were used.The following results were obtained:(1)Effect of activity on health status and production performance of cows: The effect of activity on delivery score in the early perinatal period was in accordance with the quadratic curve relationship(P<0.05).The effect of perinatal bovine activity on postpartum disease score and peak milk yield was linear(P<0.05).The effect of preperinatal cattle activity on disease score tended to conform to the quadratic curve(P<0.10).(2)Effect of activity on health status and production performance of calves: The effect of pre-perinatal bovine activity on calf birth weight,calf lactation disease score and calf lactation daily gain was linear and quadratic(P<0.05).(3)Based on the best points of each index of cows and calves and the fluctuation trend of the activity of 21 days before delivery of different indexes,it is concluded that the recommended best rest range of cows in the early perinatal period is 3800-4400steps/d.The recommended range of fluctuation in the first 21 days is less than 1000 steps,and early warning should be made in advance if the fluctuation exceeds this range.In summary,pre-perinatal cow behavior indicators play an important role in predicting the difficulty of cow delivery,postpartum health status,peak milk yield,calf birth weight,calf lactation health status and lactation daily gain.Using the best range recommended in this experiment can greatly improve production efficiency.At the same time,this experiment also recommended the optimal fluctuation range of each behavior index 21 days before delivery.When the fluctuation of prenatal behavior index of cows in the early perinatal period was greater than the recommended range,early warning and intervention should be made in time to reduce the loss of pasture and provide data basis for intelligent breeding of cows.