Original scientific paper
INFLUENCE OF FEEDING LEVEL ON FSH AND LH SECRETION PATTERNS DURING LACTATION, ON UTERUS AND FOLLICLE DEVELOPMENT AFTER WEANING IN SOWS
Martin Wähner
; Anhalt University of Applied Sciences, Dep. Agriculture, Strenzfelder Allee 28, D – 06406 Bernburg, Germany
Johannes Kauffold
; University of Leipzig, Faculty of Veterinary Medicine, D – 04103 Leipzig, Germany
Nedeljka Nikolova
; Institute of Animal Science, Ile Ilievski 92a, p.box 207, 1000 Skopje, FRY Macedonia
Abstract
Feeding during lactation has been shown to effect physiology of reproduction in sows. A study was conducted to define the hormonal patterns of FSH and LH in lactation (21 days), the development of uterus and follicles after weaning in primiparous sows fed restricted (RE) or ad libitum (AL). 14 sows were used; 7 in each group AL and in group RE (≈70% of the diet of AL-sows). An intravenous catheter was inserted on day 6/7 post partum (pp). Blood samples were collected on days 12, 15 and 18 pp. FSH and LH were analysed by RIA. Daily ultrasonography of the ovaries between day 8 and 20/21 pp was used on a few animals per group to monitor follicular growth. All sows were slaughtered either 1 or 7 days after weaning. Mean daily feed intake during lactation was 3.9 kg in AL- and 2.7 kg in RE-sows. FSH concentrations were similar in AL- and RE-sows on day 12 pp, but higher in AL-sows on day 15 and day 18 pp (P<0,05). Generally LH concentrations were higher in AL- than in RE-sows (P<0.05). The results demonstrate that lactating AL-sows had higher both LH and FSH concentrations during lactation than RE-sows. An association to simultaneously observed differences in follicular growth is assumed. The weights of uterus were higher 24 hours and 7 days after weaning, in AL-sows (399/478g) than in RE-sows (335/392g). Generally the follicular status of ALsows was more developed than in RE-sows.
Keywords
feeding; sows; lactation; follicle development
Hrčak ID:
26821
URI
Publication date:
10.3.2008.
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