Maternal performance differences between porcine stress syndrome-normal and -carrier Landrace females.

Abstract

Differences between porcine stress syndrome (PSS) normal (NN) and carrier (Nn) Landrace dams were determined for adjusted number of pigs born alive, adjusted number of pigs at 21 d, adjusted 21-d litter weight, proportion of pigs surviving to 21 d, and farrowing interval. Data were analyzed from a total of 841 females, 623 normal (NN) and 218 carriers (Nn) having 2,231 and 869 records, respectively. Three susceptible (nn) females from two herds were dropped from the analysis because of their small contribution to the total number of records. Frequency of the recessive PSS allele ranged from .07 to .28 in the nine herds involved in this study. Data were adjusted using Landrace breed-specific adjustments and analyzed with mixed-model derivative-free REML procedures fitting the dams' PSS genotype as a fixed effect in the model. Only females having two or more successive parities were used in the analysis of farrowing interval, resulting in a reduction of total records analyzed to 2,201 (1,564 NN and ABSTRACT:Differences between porcine stress syndrome (PSS) normal ( N N ) and carrier ( N n ) Landrace dams were determined for adjusted number of pigs born alive, adjusted number of pigs at 21 d, adjusted 21-d litter weight, proportion of pigs surviving to 21 d, and farrowing interval. Data were analyzed from a total of 841 females, 623 normal ( N N ) and 218 carriers ( N n ) having 2,231 and 869 records, respectively. Three susceptible (nn) females from two herds were dropped from the analysis because of their small contribution to the total number of records. Frequency of the recessive PSS allele ranged from .07 to .28 in the nine herds involved in this study. Data were adjusted using Landrace breedspecific adjustments and analyzed with mixed-model derivative-free REML procedures fitting the dams' PSS genotype as a fixed effect in the model. Only females having two or more successive parities were used in the analysis of farrowing interval, resulting in a reduction of total records analyzed to 2,201 (1,564 NN and 637 Nn records) from 632 females (445 NN and 187 Nn females). No differences between NN and Nn dams were observed for adjusted number of pigs born alive, adjusted number of pigs at 21 d, adjusted 21-d litter weight, proportion of pigs surviving to 21 d, and farrowing interval. The results of this investigation indicate no significant maternal performance differences between PSS NN or Nn Landrace dams.

Impact of RYR1 genotype of Piétrain boars on litter traits of Czech Large White × Czech Landrace crossbred sows

“…(1997) found that stress‐resistant sows (genotypes NN and Nn) were inferior to stress‐susceptible sows with regard to reproductive performance (number of piglets born alive, number of piglets weaned and piglet losses during weaning), but the differences were not significant. Stalder et al. (1997) compared the reproductive performance between NN and Nn Landrace sows.…”

SNaPshot based genotyping of the RYR1 mutation in Portuguese breeds of pigs

“…For this reason, the halothane test was used for a long time to detect recessive individuals and thus identify which parents were carriers of the n allele (Webb, 1980). When compared with NN individuals, those with the nn genotype generally have higher lean content and loin eye area, better feed efficiency, poorer maternal performance and a strong deterioration of meat quality; on the other hand, when compared with NN and nn animals, the Nn carriers have a better maternal performance and tend to be intermediate in growth and meat quality traits (Aalhus et al, 1991;Zhang et al, 1992;Leach et al, 1996;Stalder et al, 1997). As selection in the pig industry has placed a strong emphasis on leanness, this may have increased the frequency of the n allele, particularly in specialized breeds used as sire lines.…”

Effect of RYR1T Gene Polymorphism on the Initial Growth and Fattening and Slaughter Values of Polish Synthetic Line 990 Pigs Reared in Standardized Litters

“…Due to its negative influence on the quality of meat (Barton-Gade and Christensen 1998), breeding programmes provide for its elimination from pig populations of different breeds. The results of studies of some authors point out also the effect of the RYR1 genotype on sow reproduction performance results and piglet rearing (Stalder et al 1997;XunPing et al 1999). Considering the foregoing, an examination was undertaken that aimed at determining the effect of the RYR1 T gene polymorphism on the initial growth of reared gilts and barrows of the Polish Synthetic Line 990.…”

“…With reference to sow reproduction performance traits and piglet rearing indices, these results are not so straightforward. Reports within this scope of research are focused first of all on determining the association of the RYR1 genotype of sows with the rearing results of piglets from these sows (Stalder et al 1997(Stalder et al , 1998XunPing et al 1999). On the other hand, there are not many studies that refer to the effect of the RYR1 genotype of piglets on their body weight during the rearing period.…”

“…On the other hand, there are not many studies that refer to the effect of the RYR1 genotype of piglets on their body weight during the rearing period. Stalder et al (1997) analysed the rearing indices of piglets from sows with a different RYR1 genotype. They did not find significant differences with respect to the number of born piglets, the number of piglets on day 21, the litter weight on day 21 and the survival rate until day 21 of life between C/C and C/T genotypes.…”