| Objective:The third trimester is the period of fetal development and weight gain,When the maternal nutrition supply is insufficient in the third trimester,it can cause some problems such as fetal dysplasia,abortion and even deformity,resulting in a lower survival rate.Therefore,according to the breed breeding season and different physiological period of nutritional requirements,study and improve feeding methods to supplement related nutrients,guaranteed maternal nutrition in later stage of pregnancy,it is important.After a lamb has been weaned for some time,rumen function is still in its developmental stage,the intestines are not fully adapted to conventional forage and require additional nutrients.In the area outside the reclamation area grazing,the intake of nutrition of the reserve multi-parities ewes could not meet the balanced requirements.In order to ensure the breeding effect and economic benefit,nutrition supplement is also needed.In this study,multiple-fetal Suffolk were used as experimental subjects,different proportions of self-blending premixes are added to the diet.blood biochemical indices of pregnant ewe,birth weight and survival rate of lambs,production performance of weaned lambs,production performance of reserve ewe,the above indexes are test indexes.To investigate the effect of adding premix on the performance of multiple-fetal Suffolk in a specific period.Methods:(1)Sixty pregnant ewes were selected,the control group,premix groupⅠ,premix groupⅡ,respectively.Contrast feeding test was carried out.Lamb birth weights were recorded every day,Lamb deaths were recorded,blood from three groups of ewe was taken at the end of the trial,Serum was isolated and the immunity was determined.By adding two premixes to the diet of pregnant multiple-Suffolk ewes,to study the effects on immune performance and birth weight of Suffolk ewes with multiple pregnancies,comparing the two premixes,which group is more suitable for the nutritional supplement needs of late gestation ewes.(2)Select 30 weaned lambs,they were the control group and the experimental group.Contrast feeding test was carried out.the amount of feed,the amount of leftovers and the diarrhea situation were recorded daily,changes in body size and weight of lambs were recorded at the end of each month,calculate dry matter intake.By adding premix to the ration of weaned multiple Suffolk lambs,to study its effect on lamb performance.(3)Select a reserve of 60 ewes,they were the control group and the experimental group,weighed on an empty stomach on the first and last day of the experiment,calculate your daily gain.economic benefits were calculated based on local meat prices and costs,the influence on its production performance was studied.Results:(1)The total number of lambs of 20 pregnant ewes in the control group was 30,the mortality rate was 6.67%,the twin lambs rate is 50%,20 twin lambs were born,the average birth weight of lambs was 3.72 kg,8 lambs were born,and the average birth weight of lambs was 4.88 kg.The total number of lambs of 20 pregnant ewes in the premix group Ⅰ was 30,the mortality rate was6.67%,the twin lambs rate is 50%,20 twin lambs were born,the average birth weight of lambs was 4.05 kg,8 lambs were born,and the average birth weight of lambs was 5.08 kg.The total number of lambs of 20 pregnant ewes in the premix group Ⅱ was 30,no death,the twin lambs rate is 50%,20 twin lambs were born,the average birth weight of lambs was 4.13 kg,10 lambs were born per lamb,and the average birth weight of lambs was 5.57 kg.During the whole experimental period,the addition of two kinds of premix had no significant effect on the concentration of Ig A,IL-6,IL-8and IFN-γ in the blood of pregnant ewes(P>0.05).The concentrations of Ig G and Ig M in the blood of pregnant ewes in the premix group Ⅱ were significantly higher than those in the control group and the premix group Ⅰ(P<0.05),and the concentrations of Ig A,Ig G,Ig M and IL-6 in the premix group Ⅰ were also slightly higher than those in the control group,but the overall difference was not significant(P>0.05).(2)During the 90 days of feeding trial,the average daily gain of the experimental group was16.39% higher than that of the control group,the difference between the two groups reached a significant level(P<0.05).within three months,there was no significant difference in body height,body length,oblique length and chest circumference between the test group and the control group(P>0.05),compared with the control group,the feed intake of test group increased by 1.61%,the feed weight of test preparation group decreased by 12.76% compared with that of control group.(3)During the days of the trial feeding trial,The weight gain of the test group was 24.07%higher than that of the control group,and the difference in weight gain between the two groups was significant(P < 0.05),the fattening income of the test group is 35.64 yuan higher than that of the control group,in terms of average daily income,the experimental group invested 0.06 yuan more per day than the control group,and the income increased by 1.188 yuan per day,The average daily income was 29.09% higher than that of the control group.Conclusion:(1)Both premix group Ⅰand premix group Ⅱcould slightly increase the birth weight of lambs.,and slightly improve the immune performance of multiple-fetal Suffolk ewes.The effect of premix group was betterⅡ.(2)Addition of proper amount of premix can improve the daily gain,reduce the diarrhea rate,reduce the ratio of feed to gain,and have no significant effect on body size,which is beneficial to improve the performance of Suffolk lambs with multiple foetuses.(3)The production performance and economic benefit of multiple-fetal Suffolk ewes can be improved by adding proper amount of premix under grazing conditions... |
PDF Full Text Request