The Lactation Rules Of Tan Sheep Ewes Post Partum 1～30 Day And Nutrient Requirements For Lambs At 1～30D

Three experiments were carried out in this study: (1) the rules of lactation of the Tan sheep ewe postpartum 1～30 day; (2) the effect and mechanism of the Chinese herbal additives on improving the lactation performance of the ewe and the growth performance of the lambs; (3) nutrient requirements for lambs at 1～30d.Experiment 1: the rules of lactation of the Tan sheep ewe postpartum 1～30 day.6 Tan sheep ewe with strong maternity and the same birthday were selected for this experiment, which were with normal labors on 2007, April 12th, and each ewe and her lamb was taken as a repeat. The results showed that:1. milk yield of the Tan sheep ewe for 30 days was 28.075±2.038kg, the average daily milk yield was 935.84±67.92g.2. The lactation curve was consistent with the wood model and milk yield can be estimated with this equation: Y = 560 .7756t0.5458e?0.0558t.3. The lactational curve was characterized as follows: the milk production increased quickly in the initial stage; the peak amplitude appeared early; the peak-time lasted short and the milk production decreased fast after the peak-time.4. The association was strong among the milk production in different stages and also between the milk production and the lambs'gain per day. A regression equation can be established, which is useful for the accurate estimate of the milk production in different stages postpartum.Experiment 2: the effect and mechanism of the Chinese herbal additives on improving the lactation performance of the ewe and the growth performance of the lambs.A design of mono-factor and randomization was taken in this experiment, 24 pregnant ewe with close birthdays and the same fecundate times were divided into 4 groups randomly. Every group has 6 ewes and each ewe was taken as 1 repeat. Group A: control group, feeding with normal feedingstuff; Group B: feeding with normal feedingstuff and Chinese herbal additiveâ… ; Group C: feeding with normal feedingstuff and Chinese herbal additiveâ…¡; Group D: feeding with normal feedingstuff and Chinese herbal additiveâ…¢.the experiment was taken out before the delivery 10 days and after the delivery 30 days and the whole experimental stage was divided into 3 parts: 10 days before the delivery; 1¹5 days after the delivery and 16³0 days after the delivery. Every stage each ewe was fed with Chinese herbal additives 25g,50 and 0g. The result showed:1. The 3 Chinese herbal additives not only can improve the milk yield in the 1～15d after the delivery but also have transparent post-effects. The milk yield of B, C, D was increased by 6.93%, 1.72%, 5.21% respectively compared to the control in the 1～15d and in the 1～30d increased by 5.60%,2.04%,4.16%. B and D both have significant variance to the control.2. The Chinese herbal additives can improve the content of milk protein and lactose of the Tan sheep and at the same time they can also degrade the milk fat, but there wasn't any transparent variance between the B, C, D and the control(p>0.05).3. The Chinese herbal additives have a trend to imcrease the day weight gaining of the lambs and the B, C and D in the 1～15d increased by 9.88%,0.216%,5.96% respectively compared to the control as they increased by 18.97%,5.81%,12.83% in the 1～30d respectively. The effects of the Chinese herbal additives include the increasing of milk yield and the improving of milk content.4. The Chinese herbal additives can significantly raise the level of the blood plasma GH. The B, C and D raised by 19.54%,26.63% and 14.89% respectively compared to the control as significant variance among them at the same time. GH level of B and C varied more significantly(p<0.01) than that between B and C(p<0.05). Different Chinese herbal additives have different effects on PRL level. The PRL level of B and C is obviously higher than that of A and D(p<0.01)and there is no significant difference between B and C(p>0.05). The level of D is less than A obviously(p<0.01). The mechanism of improving the milk yield of the Chinese herbal additives may be by the regulating of the level of blood plasma GH and PRL.30 lambs at 1d were chosen for this experiment (female and male was 50% respectively) and each lamb was taken as a repeat. A factorial method was used in this study. The experiment was taken out from the delivery of the lamb to the lamb at 30d. With an accurate measure of the incipient body weight of each lamb, nutrient intake and body weight gaining per day, a database was established of the 30 lambs during the 30d. Then, with an equation NR = a₁×W^0.75+a₂×ADG(kg), a regression equation was established to express a quantitative relation between the nutritional requirement and metabolic weight, daily gain. By the regression equation established, the nutritional requirement under different stage and different daily gain level can be estimated. The result showed:1. Compared to the studies on this region from abroad and internal, we found: the requirement of maintenance protein was obviously higher; the maintenance energy was high and the protein for daily gain was relatively low. Perhaps this has something to do with the special varietal characteristics of the Tan sheep and the natural environment.2. Regression equations were established respectively on the requirement of digestive energy, metabolic energy, crude protein, digestive protein, 12 kinds of essential amino acids( Arginine; histidine, Isoleucine, leucine; lysine; methionine; methionine + cystine Phenylalanine + Tyrosine; proline; threonine; valine ) and 9 kinds of mineral elements( calcium; phosphorus; sodium; magnesium; iron; zinc; copper; manganese; selenium ).3. According to the regression equation established on the nutritional requirement, under different body weight(4kg,6kg,8kg,10kg), different daily gain(0g/d,100g/d,200g/d,300g/d), the nutritional requirement was estimated and a recommended was proposal for the lambs at 1～30d.