Reproductive endocrinology and postweaning performance in the multiparous sow. Part 1. Influence of metabolic status during lactation.
The metabolic status of the sow during lactation might influence reproductive endocrinology and the postweaning reproductive performance. With regard to the multiparous sow, previous studies addressing this topic are scarce and the results inconsistent. Blood samples were collected from 18 multiparous sows during lactation and after weaning for analysis of nonesterified fatty acids (NEFA), triglycerides, creatinine, urea progesterone, LH, and estradiol-17beta. Based on the average preweaning NEFA levels the sows were divided into a "high" and a "low" catabolism group. The NEFA values were higher in the "high" group during each of the last 3 weeks of lactation. The levels of urea, creatinine and progesterone were similar (P > 0.05) in the two groups throughout the study. Reproductive functions seemed equally inhibited during lactation in the two groups and there were no differences in postweaning reproductive performance. The results suggest that metabolic rate during lactation varies considerably between equally nourished multiparous sows but this has no influence on postweaning reproductive performance.
Hultén
Fredrik
F
Department of Obstetrics and Gynaecology, Centre of Reproductive Biology in Uppsala, Swedish University of Agricultural Sciences. fredrik.hulten@og.slu.se
Valros
Anna
A
Rundgren
Margareta
M
Einarsson
Stig
S
D000818:Animals; D000831:Animals, Newborn; D001835:Body Weight; D003404:Creatinine / Q000097:blood; D004958:Estradiol / Q000097:blood; D004971:Estrus / Q000502:physiology; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D007774:Lactation / Q000502:physiology*; D008098:Litter Size; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D009752:Nutritional Status / Q000502:physiology*; D010060:Ovulation / Q000502:physiology; D011374:Progesterone / Q000097:blood; D012098:Reproduction / Q000502:physiology*; D013552:Swine / Q000378:metabolism* / Q000502:physiology; D014280:Triglycerides / Q000097:blood; D014508:Urea / Q000097:blood; D014886:Weaning
D005230:Fatty Acids, Nonesterified; D014280:Triglycerides; D011374:Progesterone; D004958:Estradiol; D014508:Urea; D007986:Luteinizing Hormone; D003404:Creatinine