Effect of group size on breeding value accuracy in gilts

Janja Urankar (Avtor), Tina Flisar (Avtor), Milena Kovač (Avtor), Špela Malovrh (Avtor)

Povzetek

The objective of this paper was to analyze the effect of group size on accuracy of breeding value for fattening traits in gilts. The analysis included data from maternal genotypes, which are used in prediction of breeding value. Gilts belonged to four genotypes: Slovenian Landrace - line 11, Slovenian Large White, hybrid 12, and hybrid 21. Contemporary group represented gilts of the same genotype, which were measured at the owner on the same day. In Slovenian Landrace - line 11 one seventh of all gilts were tested in groups with one or two gilts. Less than one fifth of gilts were tested in group with 10 or more. Maximum group size was 38. Group size in Slovenian Large White is smaller due to smaller population. One fifth of all gilts were tested in groups with one or two animals. More than half gilts were tested in groups with three to ten measured gilts. Maximum group size was 12 gilts. In both breeds, proportion of untested animals was around 4%. Size of contemporary group affects the accuracy of the estimated breeding value: accuracy is higher in larger groups and consequently, smaller groups have lower accuracy predictions. Contemporary group have to include at least ten gilts per genotype and similar age. It is important to measure all gilts, including those for which we preliminary assume they will not be selected, because they contribute to accurate PBV. Because only purebred animals accumulate genetic progress, they must get more emphasis.

Ključne besede

pigs;gilts;group size;breeding value;accuracy;fattening traits;

Podatki

Jezik:	Angleški jezik
Leto izida:	2012
Tipologija:	1.08 - Objavljeni znanstveni prispevek na konferenci
Organizacija:	UL BF - Biotehniška fakulteta
Založnik:	Biotehniška fakulteta
UDK:	636.4
COBISS:	3112328
ISSN:	1854-4800
Št. ogledov:	1459
Št. prenosov:	308
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Neznan jezik
Sekundarne ključne besede:	prašiči;svinjke;velikost skupine;plemenska vrednost;točnost ocene;klavne lastnosti;
URN:	URN:NBN:SI
Vrsta dela (COBISS):	Delo ni kategorizirano
Strani:	str. 187-191
Zvezek:	ǂSuppl. ǂ3
Čas izdaje:	2012
Ključne besede (UDK):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;animal husbandry and breeding in general;livestock rearing;breeding of domestic animals;živinoreja na splošno;vzreja domačih živali;pigs;swine;prašiči;
ID:	21735