杂交肉鸭在实用饲粮条件下适宜钙磷水平的研究

选用天×建杂交鸭,随机分成12个组,喂给不同钙磷水平饲粮,对杂交肉鸭的适宜钙磷水平作了研究。结果表明:1)杂交肉鸭饲粮适宜钙磷水平,前期(0—3周龄)分别是钙0.63％,NPP0.35％;后期(4—7周龄)分别是钙0.63％,NPP0.29％;全期(0—7周龄)分别是钙0.59％,胫骨灰分及其钙磷含量随饲粮钙磷增加而增加。3)胫骨灰分与趾骨灰分含是呈极显著正相关(r=0.8117—0.9917,P<0.01)。两者均灵敏反映体内钙磷状况。4)饲粮CaO0.11％和NPP0.18％对血钙和血磷有显著性影响(P<0.05)。血磷比血钙反映灵敏,可较好地反映体内磷状况。

STUDIES ON THE OPTIMAL DIETARY CALCIUM AND BHOSPHORUS LEVELS FOR MULE DUCKLINGS

Tian×Jian day-old ducklings were divided into 12 groups and were fed corn-soybean diets containing graded levels of calcium and phosphorus (Ca 0.11, 0.30, 0.45, 0.60, 0.75, 0.90, 1.10%, N.PPo.18, 0.24, 0.35, 0.46 0.57%). The optimal dietary Ca and P levels for mule ducklings were respectively studied. The results showed as the following. 1) The optimal dietary Ca and P levels for mule ducklings were respectively 0.63% and 0.35% from o to 3 weeks, 0.63% and 0.29% from 4 to 7 weeks, 0.59% and 0.32% from o to 7 weeks. Kickets were observed when ducklings received a diet containing 0.11% Ca or 0.18% NPP. The weight gain of ducklings receiving Ca 0.90% over or NPP 0.46% over diet was significantly depressed (P<0.05), 2).The ash content of the tibia, and it is Ca and P content, and the ash content of the toes increased with the increases in the dietary Ca and P level. Ducklings receiving the optimal dietary Ca and P level diets reached optimal level of ash. The dietary Ca and P level for maximum tibia and toes ash content were respectively 0.75% and 0.57% for 3 weeks and 0.60% and 0.46% for 7 weeks, The ash contents of the tibia and toes decreased when ducklings received a dret containing Ca 0.90% over or NPP 0.57% over. 3).The ash content of the tibia was significantly correlated with the ash content of the toes (r=0.8117—0.9917, P<0.01). They could sensitively reflect the- Ca and P status of the duckling. The content of toes could be used in place of tibia ash in phosphorus studies with the ducklings. 4) Serum Ca and serum P decreased significantly when ducklings received diets containing Ca 0.11% and NPP0.18% Serum P was more responsive to alterations of dietary P than Serum Ca, and Serum P could be used as an indicator to determine the optimal dietary P level of ducklings.