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.: Home > Animal Science Papers and Reports > 2008 > Volume 26 Number 4 > Aurelia Mucha1*, Marian Rَ؟ycki1, Tadeusz Blicharski2

The use of indexes that take into account sows’ stayability to assess their reproductive utility

Aurelia Mucha1*, Marian Rَ؟ycki1, Tadeusz Blicharski2
1 National Research Institute of Animal Production, Department of Genetics and Animal Breeding, Krakowska 1, 32-083 Balice, Poland 2 Institute of Genetics and Animal Breeding Polish Academy of Sciences, Department of Animal Immunogenetics, Jastrzêbiec, 05-552 Wَlka Kosowska, Poland
Abstract :

The material consisted of the data concerning reproductive performance traits of the Polish Large
White sows, which was used in the breeding value estimation using the BLUP method in second
half of May 2008. The analysis covered sows, which gave from one to eight litters. The following two indexes were computed: WI – total number of days from sow birth date to last litter delivery day over the sum of piglets born, and WII – total number of days from sow birth date to last litter delivery day over the sum of piglets in day 21 of live. The values of both indexes decreased with successive litters. Regression coefficients were estimated on the basis of correlation between individual reproduction traits and indexes. The impact of individual traits upon the indexes changed in successive litters during the period of the use of a sow. The impact of total number of piglets in a litter decreased, and the impact of the period between first farrowing and last litter delivery increased. Considering this, longevity of sows may affect pork production profitability.

Keywords :
breeding value / pork / sow / reproductive traits / stayability

Date Deposited : 08 Aug 2011 11:08

Last Modified : 08 Aug 2011 11:08

Official URL: http://www.ighz.edu.pl/

Volume 26, Number 4, - 2008

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