Study On The Suitable Requirement Of Calcium And Phosphorus In Dietary For Latter Half Of Gestation By Ili Horses

The aim of this experiment is to study the effect of feding different calcium-phosphorus levels in dietary on apparent digestibility in latter half of of ili horses, weight after gestation,postpartum blood biochemical indexes, colostrum ingredients, colostrum fatty acid composition and the influence on newborn birth weight and body measurements, to explore the optimum levels of calcium and phosphorus nutrient requirements in diet for latter half of gestation by ili horses,in order to provide theoretical reference basis on appropriate calcium phosphate levels in determination of ili horse late pregnancy.The method of single factor randomized block design was adopted to study the effect of different calcium phosphate levels diet on ili horse body weight, blood biochemical indexes before and after the pregnancy childbirth, colostrum composition, fatty acid species composition and the influence of the newborn birth weight body measurements,to obtain appropriate calcium phosphorus requirement of ili horse gestation. 25 ili horses were selected at age 11 to 12 years of age, tires for 4~5, weight for 380 + 32 kg,randomly divided into five experimental group, each group was repeated five times. Mares were kept separately, the diet of daily feeding amount of calcium(Ca) and, respectively(P)of each group, group 1(36.0 g / 36.0 g/d, d), group 2(39.0 g / 39.0 g/d, d), group 3(42.0 g / d, 42.0 g/d),group4(45.0 g / d,45.0 g/ d),group5(48.0 g / d,48.0 g/ d),30 day trial period.The results showed that the effect of fedding different calcium phosphate levels on organics,NDF,total energy’s food consumption, output, amount of digestion and apparent digestibility were not significant, the difference of apparent digestibility of P is not significant, the digestibility of Ca is significant(P < 0.05);Feeding group 2 diet is beneficial for mare maintain weight before and after gestation,the most excellent birth weight and height of foal came from group1 and group2;From milk composition of colostrum and composition, kinds of aliphatic acid to see, the most excellent quality of colostrum came from the mare of group1 and group2;Feeding group 2 of diet,the pituitary prolactin(PRL) in the blood levels was the highest(P < 0.05), the pituitary prolactin(PRL) content decreased when more than the calcium level; Feeding group 3 of diet, the content of the E1 and E2 in blood after giving birth was the lowest(P < 0.05), then along with the increase of the diet calcium phosphate levels,there was different degree of rise but not showed regular changes; Feeding group 3 of diet, the progesterone(P) content of late pregnancy horse is higher in the blood,which helped promote mare breast growth, feeding 1 group of diet,,Low content of progesterone(P) in the blood help the secretion of colostrum.Blood calcium content with the continuous increase of calcium phosphate levels in the diet decreased significantly(P < 0.05), postpartum blood phosphorus difference between the experimental group was not significant; Feeding 1, 2, 3, 4 group of the diet on ili horse fat metabolism and protein metabolism before and after childbirth was not significant, the influence of 2, 3, 4 group of the diet is good for mare lipid metabolism and nitrogen metabolism; The horse serum growth hormone(GH) content is higher after fed the 2 group of the diet.The test reseached the effect of feeding different calcium phosphate levels diet on ili horse late pregnancy nutrients apparent digestibility, late pregnancy and childbirth stepmother horse body weight,blood biochemical indexes, colostrum composition and newborn birth weight, as the conclusions: calcium and phosphorus suitable requirements of ili horses of 400 kg weight in late pregnancy are: 39.0 g/d and28.3 g/d.