Rate of Growth as Influenced by Selection for High and Low Fatness in Swine

Hetzer, H. O.; Miller, R.H.

doi:10.2527/jas1972.354730x

Cited by 41 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although fat pigs tended to gain at a faster rate than lean pigs, average daily gain of the lean and fat pigs (.67 and .69 kg per day, respectively) for the total test period were not significantly different. Davey et al (1969) and Hetzer and Miller (1972) also found gains to be similar among pigs from lines selected for high and low backfat thickness.…”

Section: Resultsmentioning

confidence: 76%

Efficiency of Gains and Carcass Characteristics of Swine of Two Degrees of Fatness Slaughtered at Three Weights

Neely

Johnson

Walters

1979

Journal of Animal Science

View full text Add to dashboard Cite

SummaryTwo hundred barrows and gilts were slaughtered at 100, 113 and 127 kg live weight. The sample was comprised of 36 litters, of which six litters within each breed of sire (Duroc, Hampshire and Yorkshire) were classified as fat litters (2.36 cm) and six litters classified as lean litters (2.16 cm) on the basis of litter mean backfat probes taken at 68 kg live weight.Growth traits were evaluated from 9 weeks of age until the designated slaughter weight. Carcasses from the first replication (18 litters) were evaluated for percentage separable lean, fat and bone and those from the second replication (18 litters) were evaluated for percentage closely trimmed lean cuts.The fat and lean groups had similar carcass length, longissimus muscle area and percentage closely trimmed lean cuts. The fat group had significantly thicker backfat, lower percentage separable lean and a higher percentage separable fat than the lean group. The three weight groups tended to have similar average daily gains and feed efficiencies for the total test period. As slaughter weight increased from 100 to 127 kg there was an increase in carcass backfat thickness (P<.05) and longissimus muscle area (P<.01). Percentage separable lean, fat and bone of carcass were similar at each of the three slaughter weights. The 127 kg group tended to have lower percentages closely trimmed lean cuts a Journal

show abstract

Section: Resultsmentioning

confidence: 76%

Efficiency of Gains and Carcass Characteristics of Swine of Two Degrees of Fatness Slaughtered at Three Weights

Neely

Johnson

Walters

1979

Journal of Animal Science

View full text Add to dashboard Cite

show abstract

“…Controlled selection experiments with pigs, with intense selection practiced for growth rate and/or minimum backfat for periods spanning l0 or more generations, have not provided evidence of a diminution of either genetic variance or of selection response with advancing generations (e.g. Hetzer and Miller 1972;Yangen 1979). Further, the results from these and other long-continued artificial selection with this species have not identified any important genetic antagonisms involving reproductive traits (Steane 1981).…”

Section: Evidence Of Selection Limits In Pig Populationsmentioning

confidence: 99%

Selection Limits: Have They Been Reached With Pigs?

Fredeen¹

1984

Can. J. Anim. Sci.

View full text Add to dashboard Cite

show abstract

“…They recommend using breed specific sex adjustments. Hetzer and Miller (1972) found breed differences between daily gain and backfat depth correlations. McKay and Garnett (1988) found interactions with breed, season, and sex for the regression of probed backfat depth on body weight.…”

Section: Adjustment Factorsmentioning

confidence: 90%

Genetic parameters of pork quality traits

Goodwin

View full text Add to dashboard Cite

Breed differences of meat quality traits estimated from Model [2]. Least squares means and standard errors. Breed differences of longissimus dorsi composition traits estimated by Model [2]. Least squares means and standard errors. Breed differences of longissimus dorsi eating quality traits estimated by Model [2]. Least squares means and standard errors. Breed by sex interaction least squares means and standard errors estimated by Model [2]. Breed by halothane genotype (Normal = NN and Heterozygote = Nn) interaction least squares means and standard errors estimated by Model [2]. Genetic parameters of growth and carcass traits estimated with Model [3]. Genetic and environmental variances and covariances of growth and carcass traits estimated with Model [3]. Genetic parameters of meat quality traits estimated with Model [3]. Genetic and and environmental variances covariances of meat quality traits estimated with Model [3]. Genetic parameters of pork longissimus dorsi composition traits estimated with Model [3]. Genetic variance and covariance of pork longissimus dorsi composition traits estimated with Model [3]. Genetic parameters of eating quality traits estimated with Model [3]. Genetic and environmental variances and covariances of eating quality traits. Genetic parameters of selected growth, carcass, composition, meat quality and eating quality traits estimated by Model [3]. vi Table 30. Genetic and environmental covariances for selected growth, carcass, composition, meat quality and eating quality traits estimated by Model [3].

show abstract

Rate of Growth as Influenced by Selection for High and Low Fatness in Swine

Cited by 41 publications

References 0 publications

Efficiency of Gains and Carcass Characteristics of Swine of Two Degrees of Fatness Slaughtered at Three Weights

Efficiency of Gains and Carcass Characteristics of Swine of Two Degrees of Fatness Slaughtered at Three Weights

Selection Limits: Have They Been Reached With Pigs?

Genetic parameters of pork quality traits

Contact Info

Product

Resources

About