Optimization of Lactating Period Duration and Its Influence at Fertilization of Belarusian Breeds of Sows

Abstract

Researches at gross commodity production determined that with full-value feeding of sows the optimal period of lactation can make up 35-45 days, the allowable limit - 26 days. With mixed forages deficiency such as CK-11, CK-16 and CK-21 piglets should be weaned on 45-56^th day, allowable limit is 35 days. Interbreed differences of sows’ fertilization rate were determined. Sows of Belarusian Meat Breed has the best fertilization rate (79,8% for the first farrowing and 80,7% for two and more farrowings). One-farrowing sows of Duroc Breed has the worst fertilization rate (74,1%; P<0,001). There is a specific difference on breeds between one-farrowing sows and multi-farrowing once; Big White Breed - tendency to fertilization rate decrease within sows’ age growth (at 2,4 percentage units), Belarusian Meat Breed - tendency to increase (at 0,9 percentage units), Duroc Breed - growth of multi-farrowing sows’ fertilization rates (at 7,8 percentage units) - in September. What concerns seasons, the differences depending on seasons are inauthentic.