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GENETIC PARAMETERS OF REPRODUCTION TRAITS OF PROLIFIC AND CONVENTIONAL PUREBRED PIGS
Vitomir Vidović
; Faculty of Agriculture, Novi Sad, Serbia
Ljuba Štrbac
; Faculty of Agriculture, Novi Sad, Serbia
Dragomir Lukač
; Faculty of Agriculture, Novi Sad, Serbia
Desanka Punoš
; Farmdizajn, Novi Sad, Serbia
Radoslav Šević
; AD Bačka, Bačka Palanka, Serbia
Milanko Stupar
; Faculty of Agriculture, Novi Sad, Serbia
Vladislav Višnjić
; SIZIM, Veliki Otok, Croatia
Jovanka Krnjajić
; DELTA Agrar, Stara Pazova, Serbia
Sažetak
Trials were performed on four farms including 1887 highly fertile Landrace and Yorkshire sows, and 24 boars of Danish origin, or 6324 consecutive parities, in the period from 2009 to 2011. In evaluating genetic parameters of conventional Landrace and Yorkshire breeds 3628 sows were included mating with 48 males or the total of 12344 litters. Estimated genetic parameters of litter size traits show the similar tendency and the regulatory of the purebred sows that produce 11-15 weaned piglets less per sow/year. Environmental factors, HYS, showed significant effect on the examined traits. Heritability and repeatability of alive and stillborn piglets, litter size on the fifth day after birth and number of piglets weaned have a low hereditary traits coefficient whose values vary within the limits of 0.08 to 0.10 for the heritability and from 0.15 to 0.19 for the repeatability. There was a tendency to lower values of genetic parameters in the conventional compared to highly fertile sows. Research suggests that both prolific breeds L and Y sows had first farrowing at the age of one year. This indicates heavier animal at entering the production, which guarantees the continuity of a stable production of pigs and optimal replacement. Conventional selection animals of the same L and Y breeds were at least one month younger at farrowing and of smaller size. This indicates shorter life production and smaller litter size. The differences between genetic parameters of prolificacy and conventional purebred L and Y belong to selection efficiency during generations.
Ključne riječi
pigs; genetic parameters; selection differential
Hrčak ID:
87468
URI
Datum izdavanja:
20.9.2012.
Posjeta: 1.054 *