The objective of the study was to investigate the effects of dietary energy levels and sources on the blood metabolites,hormone secretion and the composition of follicular fluid in gilts.Fifty-four gilts with initial body weight of（59±4.2） kg were randomly allotted to six treatments.Treatments were low, normal,and high energy feeding levels,which were 87.5%,100%and 112.5%of recommendatory energy requirements by NRC（1998）,respectively,and dietary energy sources（starch or fat）.Blood samples and follicular fluids were collected on D18 and D19 of the second estrous cycle.The results showed that plasma concentrations of triglycerides and total cholesterol were higher in the fat group than that in the starch group（P<0.05）,but those of glucose were similar between the two energy sources（P>0.05）;dietary energy level exerted no effect on blood metabolites concentration（P>0.05）.Gilts fed the high energy diet had a higher area under curve of plasma insulin（Insulin AUC）,insulin-like growth factor-Ⅰ（IGF-Ⅰ） and leptin than did gilts fed the lower energy diet（P<0.05）,but there was no significant difference between fat versus starch（P>0.05）.Luteinizing hormone（LH） pulses were higher in gilts fed high energy rather than that in low energy diets（P>0.05）,plasma concentration of estradiol（E2） was higher in the fat group than that in the starch group（P<0.05）.The number of large follicles（diameter≥4 mm） and concentrations of IGF-Ⅰand E2 in follicular fluid were increasing significant as the level of energy increased（P<0.05）,but the numbers of large follicles and follicular fluid composition were not affected by the source of dietary energy（P>0.05）.The results indicate that gilts fed high energy diets had elevated plasma concentrations of metabolic hormones,IGF-Ⅰand LH secretion,and increased follicular fluid concentrations of IGF-Ⅰ,E2 and numbers of large follicles;gilts fed the dietary fat had a
ZHOU Dong-sheng,ZHUO Yong,WU De~*,WANG Yan-zhong,TAN Xian-yi,ZHOU Ping (Key Laboratory for Animal Disease-Resistance Nutrition of China Ministry of Education, Animal Nutrition Institute,Sichuan Agricultural University,Ya’an 625014,China)
＜正＞Our objective was to study the effect of dietary energy level and source on follicular development, follicu...
Zhou Dongsheng Wu De Wang Yanzhong Tan Xianyi Zhou Ping Zhuo Yong Animal Nutrition Institute of Sichuan Agricultural University,Key Laboratory for Animal Disease Resistance Nutrition of the Ministry of Education of China,Ya''an 625014,China
