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The response of breeding sows and gilts to two levels of protein and food intake over several parities

Published online by Cambridge University Press:  27 March 2009

D. L. Frape ,
J. Wilkinson ,
L. G. Chubb  and
K. L. Wolf
D. L. Frape
Affiliation:
Spillers Limited, Kennett Nutritional Centre, Bury Road, Kennett, Nr Newmarket, Suffolk
J. Wilkinson
Affiliation:
Spillers Limited, Kennett Nutritional Centre, Bury Road, Kennett, Nr Newmarket, Suffolk
L. G. Chubb
Affiliation:
Spillers Limited, Kennett Nutritional Centre, Bury Road, Kennett, Nr Newmarket, Suffolk
K. L. Wolf
Affiliation:
Spillers Limited, Research and Development Farm, Middle Aston, Nr Steeple Aston, Oxfordshire
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Summary

An experiment, involving 68 female pigs, was undertaken to measure the effects of two diets differing in protein content, and of two patterns of feeding. The animals were housed in an enclosed building. The experiment extended through several parities; culled sows were replaced by gilts during the experiment, the whole course of which lasted 5 years.

The diets were given at the rate of 1–8 or 2–3 kg per day throughout gestation, but the rate was reversed during the 5-week lactation so that, for litters of eight to nine pigs sows in each treatment group received the same quantity of food per parity. As a result of unsatisfactory performance, dietary composition was changed after 2 years so that for the last 3 years the digestible energy contents were higher.

Treatments significantly influenced gestation live-weight gain, lactation weight loss and gestation backfat gain. The lower rate of gestation feeding was associated with low or negative gestation weight increases after the third to fourth litters, and a greater apparent rate of decline with increasing age in birth and 3-week weight per piglet. The high gestation, low lactation, rates of feeding led to slightly greater litter size and lower weaning weights per pig. A daily intake of 208 g crude protein and 8'3 g lysine appeared to meet the sow's requirements throughout gestation.

In the pregnant sow feeding area, winter air temperatures were on average 16 °C below those in the summer, but were rarely below freezing point. Winter backfat gain was lower than, and gestation gain only half that in the summer. Litter size was also greater following summer pregnancies and 3-week weight per pig was greater following winter pregnancies. Independent of litter size, birth and 3-week weight per pig were positively correlated with gestation gain within treatment and season. The apparent positive correlation of litter size at 3 weeks with gestation backfat and weight gain was not found at birth. Litter size at birth was negatively correlated with gestation gain within season. The percentage of fertile matingswas less for matings between 1 September and 31 January. This coincided approximately with the reduced litter size (alive) which occurred following winter gestations.

Lactation weight loss and 3-week weight per pig declined with increasing age of sow and the degree of weight loss was unrelated to subsequent litter size.

The apparent effect of seasons and treatments on litter size at birth appeared not to be an obvious function of changes in live weight, which were also marked between seasons and treatments, but level of food intake in early gestation may have affected litter size independently. It was concluded that birth weight especially in the older sows, was associated with the rate of food intake in gestation, and possibly also in lactation, and with gestation empty weight gain.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 76 , Issue 1 , February 1971 , pp. 73 - 82
Copyright
Copyright © Cambridge University Press 1971

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