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GENETIC DIFFERENCES BETWEEN MANGULICA AND YORKSHIRE OF CERTAIN TRAITS IN RELATION TO SELECTION CRITERIA
Vitomir Vidović
; Faculty of Agriculture, Novi Sad, Serbia
Radoslav Šević
; AD Bačka, Bačka Palanka, Serbia
Ljuba Štrbac
; Faculty of Agriculture, Novi Sad, Serbia
Dragomir Lukač
; Faculty of Agriculture, Novi Sad, Serbia
Desanka Punoš
; Farmdizajn, Novi Sad, Serbia
Vladislav Višnjić
; SIZIM, Veliki Otok, Croatia
Jovanka Krnjaić
; DELTA Agrar, Stara Pazova, Serbia
Milanko Stupar
; Faculty of Agriculture, Novi Sad, Serbia
Sažetak
The trial was done on the same farm on Mangulica (M) and Yorkshire (Y) from 2009. to 2012. The data included 432 M and 675 Y litters. Mass selection was used to select M in all traits. Meanwhile Y was selected by selection index. The Y sows produced 23.4 weaned piglets per sow/year. In case of M it was only 11. To analyse growth and carcass traits the trial included 157 M and 212 Y animals. The farm condition was similar during gestation and lactation. The MME was used to analyse fixed effects of YS, breed and parity and sire as random ones. The losses of piglets in lactation were 8.8 % for M and 7.5% at Y. Losses in weaning for M were 12.7% and for Y 3.0%. In fattening up to 132 kg M age was 540 days. At the same time Y reach 133 kg using only 227 days. There were no losses during fattening. The life gain of M was 243 g and of Y 584g. Feed conversion (FC) for M was 5.2 kg or 678 kg of feed in total and Y was 3.2 FC, 419 kg in total. The difference of 259 kg of feed was statistically significant. Taking value of 0.25 euro for kg of food, it comes out that M pig cost 66 euro more than Y. Both M and Y had no losses during fattening period. Dissection of carcass was done following EU Procedure 92. Meat content in carcass in M was 29.0% and 58.6% in Y. The difference of 29.6 % was highly significant. It comes out that M produced about 23.6 kg meat less compared to Y. Protein content was measured at 4 places in carcass of both breeds. Average protein in M was 20.4% but in Y 2.4% more i.e. 22.8%. In conclusion, M showed economically very poor results related to Y. To improve genetic potential in M certain breeding programs must be developed and knowledge and money provided for better results. Mass selection showed inefficiency and inferiority in M compared to index one in Y where aggregate genotype included 5 hereditary different traits.
Ključne riječi
pigs; genetic differences; production traits
Hrčak ID:
87479
URI
Datum izdavanja:
20.9.2012.
Posjeta: 1.466 *