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Coordinated trials on the protein requirements of sows 1. A comparison of four levels of dietary protein in gestation and two in lactation

Published online by Cambridge University Press:  02 September 2010

J. F. D. Greenhalgh ,
F. W. H. Elsley ,
D. A. Grubb ,
A. L. Lightfoot ,
D. W. Saul ,
P. Smith ,
N. Walker ,
D. Williams  and
M. L. Yeo
J. F. D. Greenhalgh
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB, and cooperating centres
F. W. H. Elsley
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB, and cooperating centres
D. A. Grubb
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB, and cooperating centres
A. L. Lightfoot
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB, and cooperating centres
D. W. Saul
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB, and cooperating centres
P. Smith
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB, and cooperating centres
N. Walker
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB, and cooperating centres
D. Williams
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB, and cooperating centres
M. L. Yeo
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB, and cooperating centres
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Summary

1. Gestation diets formulated to contain A, 9; B, 11; C, 13 or D, 15% protein, and lactation diets with C, 13 or E, 17% protein provided eight treatment combinations. They were given at seven centres at 2 kg/day in gestation and approximately 5·7 kg/day in lactation to sows which remained on experiment for three to five parities and produced in total 468 litters. Mean results for parities one to four are given in this summary.

2. For gestation diets A to D mean litter size at birth was 9·7, 10·1, 10·3 and 10·4 live pigs, and at weaning (at 6 weeks), 8·2, 8·7, 8·8 and 8·8. Sows which received lactation diets C and E subsequently produced 10·4 and 10·3 pigs at birth and 8·9 and 8·3 at weaning.

3. Gestation diets had no consistent effects on piglet weights. During lactation, however, diet E gave heavier pigs than C, by 0·2 kg at 3 weeks and 0·5 kg at weaning.

4. Extra protein for either gestation or lactation had a positive effect on sow weight at that stage, but a negative effect in the following stage. There were no direct treatment effects on the time required for re-conception.

5. Twenty experimental sows at the Rowett Institute, together with an additional group given diet A for both gestation and lactation, showed strong positive relationships between lactation protein intake and milk yield or composition.

6. The treatment combination AC (i.e. 9% protein in gestation and 13% in lactation) gave the lowest weight of weaned pigs per litter, and CC gave the highest. The remaining treatments gave similar weights; of these BC (nominally 11 with 13, but actually 11·5 with 13·5% protein) was concluded to provide the lowest protein intake consistent with satisfactory performance.

Type
Research Article
Information
Animal Production , Volume 24 , Issue 3 , June 1977 , pp. 307 - 321
Copyright
Copyright © British Society of Animal Science 1977

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References

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