陕北白绒山羊断奶羔羊钙磷需要量的研究

doi:10.11843/j.issn.0366-6964.2018.01.014

Abstract

Abstract:

The study was conducted to evaluate the effects of dietary with different calcium and phosphorus levels on growth performance, nutrient digestibility and metabolism of weaned lambs in Shaanbei White Cashmere goat, which would provide scientific basis for formulating standard of calcium and phosphorus requirement of weaned lamb of Shaanbei White Cashmere goat. Thirty-six weaned lambs of Shaanbei White Cashmere goat with((16.48±2.37)kg) were randomly selected and assigned to 4 groups, and each group had 3 repeats with 3 goats. The goats were fed with 4 different diets:Ⅰgroup(0.60% Ca, 0.45% P),Ⅱgroup(0.60% Ca, 0.65% P),Ⅲ group(0.80% Ca, 0.45% P) and Ⅳ group(0.80% Ca, 0.65% P) in a 2×2 factorial arrangement. The experiment lasted for 65 d. On the 30th day of the trial, one goat from each repeat was selected and fed individually in cage to carry out the digestion and metabolism experiments. The results showed that:1) Calcium and phosphorus supplementation in the basal diet had no significantly influence on DMI (P>0.05), but increased ADG remarkably (P<0.05) with the increasing of dietary Ca and P levels. 2) Dietary Ca levels had significantly influence on apparent digestibility and metabolic rate of gross energy (P<0.05). 3) Calcium and phosphorus supplementation in the basal diet had significantly influence on intake Ca or P, excretion Ca or P and deposited Ca or P (P<0.05), respectively. The relationships between excretion Ca or P and intake Ca or P were showed in the following regression equations, for Ca:Y=0.662X+0.929 (R²=0.993) and for P:Y=0.776X+0.506 (R²=0.996), the endogenous loss of Ca and P of weaned lamb of Shaanbei White Cahmere goats were 0.929 and 0.506 g·d^-1, respectively. The relationships between deposited Ca or P and ADG were showed in the following regression equations, for Ca:Y=47.737X-21.622 (R²=0.649) and for P:Y=53.770X+18.973 (R²=0.448). These results indicated that the relationships between deposited Ca or P and ADG of weaned lambs in Shaanbei White Cashmere goat were linear. Under the conditions of the study, the optimal dietary supplementation levels of calcium and phosphorus are 0.80% and 0.45% for weaned lambs of Shaanbei White Cashmere goat, respectively.

CLC Number:

S827.5

WANG Hao, LIN Chang-long, ZHOU Guang-chen, CHEN Yu-lin, YANG Yu-xin. Study on Calcium and Phosphorus Requirement of Weaned Lamb in Shaanbei White Cashmere Goat[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2018, 49(1): 121-130.

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Study on Calcium and Phosphorus Requirement of Weaned Lamb in Shaanbei White Cashmere Goat

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