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The effects of dietary protein and energy levels of diets offered during lactation on the lactational and subsequent reproductive performance of first-litter sows

Published online by Cambridge University Press:  02 September 2010

S. M. Tritton ,
R. H. King ,
R. G. Campbell ,
A. C. Edwards  and
P. E. Hughes
S. M. Tritton
Affiliation:
Rhône-Poulenc Animal Nutrition, Wellington Office Centre, 2 Portrush Road, Payneham, SA 5070, Australia
R. H. King
Affiliation:
Victorian Institute of Animal Science, Sneydes Road, Werribee, Victoria 3030, Australia
R. G. Campbell
Affiliation:
Bunge Meat Industries Ltd, Redlands Road, Corowa, NSW 2646, Australia
A. C. Edwards
Affiliation:
Ace Livestock Consulting Pty Ltd, PO Box 108, Cockatoo Valley, SA 5351, Australia
P. E. Hughes
Affiliation:
Agriculture and Forestry Department, University of Melbourne, Parkville, Victoria 3052, Australia
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Abstract

A total of 315 first parity sows were used in two experiments to establish the lactational and subsequent reproductive performance of first-litter sows in response to varying levels of dietary amino acids and digestible energy (DE) offered during lactation. In the first experiment, sows were offered five diets ranging in lysine content from 6·2 to 15·1 g/kg. In the second experiment sows were offered five diets with a similar lysine: DE ratio (0·88 to 0·85 g/MJ) but ranging in DE content from 12·6 to 15·1 MJ/kg. Voluntary food intake during lactation was unaffected by lysine or DE content of the diets. Piglet pre-weaning growth was similarly unaffected by dietary DE content but responded in a curvilinear manner with increasing dietary lysine. Sow body-weight loss during lactation was unaffected by dietary lysine but declined with increasing DE content up to 13·8 MJ/kg. Backfat loss was lowest for sows offered the lowest lysine diet and tended to reach a plateau at a dietary level of 10·6 g lysine per kg. In response to dietary DE content, backfat loss tended to be highest for sows offered the diet of lowest DE content and declined with increasing DE content up to 15·1 MJ DE per kg. The subsequent weaning to remating interval was unaffected by dietary DE content. Subsequent litter size was similarly unaffected by dietary DE content but was significantly higher for sows offered the two higher, compared with the two lower, lysine diets (10·7 v. 9·6 born alive, s.e.d. 0·5, P < 0·05). The results suggest that current amino acid recommendations for lactating first-litter sows are inappropriate and may be constraining both milk production and subsequent reproductive performance.

Keywords

digestible energylactationlysinesows
Type
Research Article
Information
Animal Science , Volume 62 , Issue 3 , June 1996 , pp. 573 - 579
Copyright
Copyright © British Society of Animal Science 1996

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