The effect of condition at farrowing upon the subsequent milk yield and the efficiency of production

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Summary: The yield and composition of the milk, and the energetic efficiency of production of two groups of sows, one of which was in high condition at farrowing and the other in low condition, are reported. Both groups were fed on a low ration during lactation. The sows in low condition lost less weight and produced slightly less milk and milk energy than those in high condition, the mean yields per sow being 546 and 579 pounds respectively for the last seven weeks of lactation. Several methods have been evolved to estimate the energetic efficiency of production over gestation, lactation, and the whole reproductive cycle. The effect of various feeding regimes at different stages of the reproductive cycle upon the energetic efficiency of the sow are discussed.

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