title: Effect of different levels of short-term feed intake on folliculogenesis and follicular fluid and plasma concentrations of lactate dehydrogenase, glucose, and hormones in Hu sheep during the luteal phase.
abstract: This study investigated the effects of short-term food restriction or supplementation on folliculogenesis and plasma and intrafollicular metabolite and hormone concentrations. Ewes were randomly assigned to three groups: the control group received a maintenance diet (M) while the supplemented group and restricted group received 1.5×M and 0.5×M respectively on days 6-12 of their estrous cycle. Estrus was synchronized by intravaginal progestogen sponges for 12 days. On days 7-12, blood samples were taken. After slaughter, the ovarian follicles were classified and the follicular fluid was collected. Compared with restriction, supplementation shortened the estrous cycle length, decreased the number of follicles 2.5-3.5 mm and follicular fluid estradiol (E2) concentration, increased the number of follicles>3.5 mm and plasma glucose, insulin and glucagon concentrations, and augmented the volume of follicles>2.5 mm. Restricted ewes had higher intrafollicular insulin concentration, but it was similar to that of supplemented ewes. Compared with follicles≤2.5 mm, the intrafollicular glucose and E2 concentrations were increased and the testosterone, insulin, and glucagon concentrations and lactate dehydrogenase (LDH) activity were decreased in follicles>2.5 mm. Only in restricted ewes were intrafollicular LDH and testosterone concentrations in follicles≤2.5 mm not different from those in follicles≤2.5 mm. In conclusion, the mechanism by which short-term dietary restriction inhibits folliculogenesis may involve responses to intrafollicular increased E2, testosterone, and LDH levels in late-stage follicles. This may not be due to the variation of intrafollicular insulin level but rather due to decreased circulating levels of glucose, insulin, and glucagon.
authors: Institute of Sheep and Goat Science, Center of Animal Embryo Engineering and Technology, Nanjing Agricultural University, Jiangsu, Nanjing 210095, China.
authors: Shijia
authors: S
authors: Ying
authors: Ziyu
authors: Z
authors: Wang
authors: Changlong
authors: C
authors: Wang
authors: Haitao
authors: H
authors: Nie
authors: Dongyang
authors: D
authors: He
authors: Ruoxin
authors: R
authors: Jia
authors: Yongcong
authors: Y
authors: Wu
authors: Yongjie
authors: Y
authors: Wan
authors: Zhengrong
authors: Z
authors: Zhou
authors: Yibo
authors: Y
authors: Yan
authors: Yanli
authors: Y
authors: Zhang
authors: Feng
authors: F
authors: Wang
mesh_terms: D000821:Animal Feed; D000818:Animals; D001774:Blood Chemical Analysis; D001786:Blood Glucose / Q000032:analysis / Q000378:metabolism; D031204:Caloric Restriction / Q000662:veterinary; D019587:Dietary Supplements; D004435:Eating / Q000502:physiology*; D005260:Female; D015571:Follicular Fluid / Q000737:chemistry* / Q000378:metabolism; D005947:Glucose / Q000032:analysis* / Q000378:metabolism; D006728:Hormones / Q000032:analysis* / Q000097:blood / Q000378:metabolism; D007770:L-Lactate Dehydrogenase / Q000032:analysis* / Q000097:blood / Q000378:metabolism; D008183:Luteal Phase / Q000097:blood / Q000378:metabolism / Q000502:physiology; D009994:Osmolar Concentration; D006080:Ovarian Follicle / Q000502:physiology*; D012756:Sheep / Q000097:blood / Q000378:metabolism / Q000502:physiology*; D013997:Time Factors
chemical_list: D001786:Blood Glucose; D006728:Hormones; D007770:L-Lactate Dehydrogenase; D005947:Glucose