9397至尊信誉威尼斯

母猪乳产量、组成和仔猪养分摄入对断奶仔猪生长和体组成的影响

发布单位:9397至尊信誉农牧科技集团有限企业

查看次数:336

时间:2020-04-03
本试验的主要目的在于研究乳摄入量、乳组成和仔猪养分摄入对断奶仔猪生长性能和体组成的影响。试验1使用氘稀释技术建立44头仔猪体脂、体蛋白、灰分和水分的预测方程。此外,试验2使用21头第二胎母猪的仔猪,总计294头。在这个试验中,在哺乳第3、10、17和25天对仔猪称重。在同一天,检测乳摄入量和仔猪体组成。

数据显示,仔猪体增重与乳摄入量和乳组分显著正相关,全期r值从0.65~0.93不等(P<0.001)。当对仔猪生长性能进行归因分析时,乳摄入和乳蛋白含量可以说明仔猪第二周和第三周增重变化情况的85%和87%,而仔猪第一周增重的唯一预测因子是乳摄入量,它可以说明81%增重的变化。仔猪脂肪、蛋白和能量沉积速度与乳摄入量和乳养分摄入量高度相关,r值从0.76~0.94不等(P<0.001)。仔猪增重和沉积速度与乳组成呈弱相关性,r值从0.01~0.50不等(正相关或者负相关)。体增重、断奶时体脂含量与乳蛋白浓度的拟合曲线说明当乳蛋白为4.9%时,体增重较高、体脂率较低,但是应当强调的是这种二次线性效果并没有达到显著水平。断奶时体脂率与乳摄入量、乳脂率正相关(R2=0.44、0.46,P<0.001)。

总之,乳摄入量对仔猪生长速度具有重要影响,乳脂摄入量极大的影响了断奶时体脂率,而乳组成对这些指标的影响相对较小。

Impact of milk and nutrient intake of piglets and sow milk composition on piglet growth and body composition at weaning

The main objective of this study was to evaluate the impact of milk intake, milk composition, and nutrient intake on piglet growth in lactation and body composition at weaning. To evaluate the body composition of piglets, data from one experiment (44 Danish Landrace × Yorkshire × Duroc piglets) were used to develop prediction equations for body pools of fat, protein, ash, and water based on live weight and deuterium dilution space (exp. 1). Furthermore, a total of 294 piglets (Danish Landrace × Yorkshire × Duroc) from 21 sows of second parity were included in a second experiment (exp. 2). In exp. 2, piglet live weight was recorded on days 3, 10, 17, and 25 of lactation. On the same days, the milk intake and body composition were measured, using the deuterium oxide (D2O) dilution technique. Piglet weight gain was highly positively correlated with the intake of milk and the intake of milk constituents each week and on an overall basis having r values ranging from 0.65 to 0.93 (P < 0.001). When evaluating regressions for piglet growth, the milk intake in combination with the milk protein concentration explained 85% and 87% of the total variation in piglet gain in the second and third week of lactation, respectively, whereas milk intake was the only predictor of piglet gain in the first week of lactation explaining 81% of the variation. Fat, protein, and energy retention rates were all highly positively correlated with the daily intake of milk and intake of milk nutrients with r values ranging from 0.76 to 0.94 (P < 0.001). Piglet gain and retention rates were rather weakly correlated with the milk composition with r values ranging from 0.01 to 0.50 (being either negative or positive). Curvilinear response curves were fitted for live weight gain and body fat content at weaning in response to milk protein concentration, showing that live weight gain was slightly greater and body fat content was slightly lower at 4.9% milk protein, but it should be emphasized that the quadratic effects did not reach significance. Body fat content at weaning was positively related with the intake of milk (R2 = 0.44, P < 0.001) and milk fat (R2 = 0.46, P < 0.01). In conclusion, milk intake had a major impact on the piglet growth rate, and milk fat intake greatly influenced the body fat percentage at weaning, whereas milk composition per se only played a minor role for these traits.

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