Selection for High and Low Fatness in Swine: Correlated Responses of Various Carcass Traits

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

doi:10.2527/jas1973.3761289x

Cited by 35 publications

(10 citation statements)

References 6 publications

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“…Carcasses of obese pigs were shorter, fatter, less muscular and contained less skeletal mass (as indicated by bone trimmed from rough cuts) than carcasses of lean pigs at the termination of the study (table 4). Previous studies on obese and lean pigs indicated similar results (Davey et al, 1969;Hetzer and Miller, 1973;Davey and Bereskin, 1978;Pond et al, 1980Pond et al, , 1981. Carcass weights were similar in the two groups (table 4), even though the live weights (table 2) were different (obese < lean).…”

Section: Resultssupporting

confidence: 69%

“…Hetzer and Harvey (1967) developed obese and lean strains of swine by selection for thick or thin backfat for about 18 generations. The divergence of carcass composition in the original strains during selection was established (Hetzer and Miller, 1973), as was the compositional difference between the obese and lean pigs at young ages (Davey and Bereskin, 1977). Some nutritional requirements were studied also.…”

Section: Introductionmentioning

confidence: 99%

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Use of Carbohydrate and Fat as Energy Source by Obese and Lean Swine

Mersmann¹,

Yen²

1984

Journal of Animal Science

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Genetically obese and lean pigs were fed isonitrogenous-isoenergetic (digestible energy) amounts of a high or low fat diet from 25 kg body weight. Obese pigs gained less and required more feed per unit gain than lean pigs. Lean pigs were more muscular with less fat than obese pigs. Obese pigs utilized more dietary amino acids for energy (greater plasma urea N) than did lean pigs. Weight gain was similar at all intermediate periods in obese pigs fed the two diets. However, gain tended (P less than or equal to .10) to be greater and the ratio of dietary energy intake to gain tended (P less than or equal to .10) to be less in obese pigs fed high compared with low fat diets. Similar results were observed in lean pigs fed the two diets. The high fat diet produced more carcass adipose tissue deposition in both strains after 20 wk of feeding (detectable by ultrasound at 14, but not at 7 wk). Adipose tissue lipogenic rate (glucose incorporation) was similarly depressed by fat feeding in both obese and lean pigs. Obese and lean pigs both utilized dietary carbohydrate and fat differentially but there was no indication of genetic divergence regarding this utilization. In both strains of pigs, energy from the fat-enriched diet was preferentially partitioned into carcass adipose tissue.

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Section: Resultssupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Use of Carbohydrate and Fat as Energy Source by Obese and Lean Swine

Mersmann¹,

Yen²

1984

Journal of Animal Science

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“…The value of these results is that they provide information on differences in a range of carcass characteristics which existed in groups of animals selected to represent contrasting levels of weight-adjusted ultrasonic backfat depths. Dressing-out percentage A posi ti ve relationship between fatness and dressingout percentage has been reported in several other studies with sheep (Bradford & Spurlock 1972;Kirton et al 1984) and pigs (Hetzer & Miller 1973;Chadwick 1977). The line difference in dressing-out percentage shown here paralleled breed differences reported by Wood et al (1983a) in that the group dressing out better was not only fatter but also had lighter non-carcass components.…”

Section: Selection Linesmentioning

confidence: 89%

Carcass characteristics of Southdown rams from high and low backfat selection lines

Kadim

Purchas

Rae

et al. 1989

New Zealand Journal of Agricultural Research

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Carcass characteristics of Southdown rams from lines selected for high or low backfat depths (assessed ultrasonically at Position Cover the longissimus dorsi muscle at the last rib) were compared. Rams were 15-18 months old and average carcass weight was 29.5 kg fo{ the High-line (n = 36) and Low-line (n = 42) groups. When adjusted by covariance to the same carcass weight, animals from the High-line had higher dressing-out percentages, lighter weights of several internal organs, and shorter carcasses. At a constant side weight, the High-line sides contained 18% more dissectible fat and significantly lighter weights of muscle and bone. However, muscle to bone ratio and muscularity in terms of muscle weight per unit length were greater for the High-line group. The High-line carcasses contained a greater proportion of their weight in the rack and loin cuts. The greater weights of four dissectible fat depots in the High-line carcasses were the result oflarger rather than more adipocytes. The results show that selection on the basis of a single fat depth measurement resulted in significantdifferences in all measures of fatness, and also in several other carcass characteristics.

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“…Hetzer and Miller (1973) report differences in the direction and magnitude of correlated response in growth to changes in backfat thickness in their selection experiments with Duroc and Yorkshire pigs. They explained it by differences in genetic correlations that were positive in Duroc and negative in Yorkshire and the interaction with inbreeding in the latter.…”

Section: Discussionmentioning

confidence: 99%

Asymmetric genetic correlations between dairy traits

Pirchner¹,

Nibler²

2000

J Animal Breeding Genetics

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Realized genetic correlations between dairy traits were estimated from halfsib response to (a) upward, respectively downward selection and (b) to different selected traits. Data comprised records from 36 870 Bavarian Fleckvieh and from 9434 Angler cows from the years 1977-88 and 1990, respectively. No asymmetry appeared between upward and downward selection. However, in both breeds selection for yield led to stronger negative reaction in fat and protein content than vice versa. Between protein and fat content the realized correlation appears to be symmetric. Zusammenfassung Asymmetrische genetische Korrelationen zwischen MilchleistungseigenschaftenGenetische Korrelationen zwischen Milchmenge, Fett und Proteingehalt wurden von diesbezü glichen Veränderungen in Halbschwestern selektierter Kü he nach (a) positiver und negativer Selektion und (b) in Abhängigkeit vom selektierten Merkmal geschätzt. Die Daten stammen von 36 870 Fleckvieh und 9434 Angler Kü hen aus den Jahren 1977Jahren bis 1988Jahren bzw. 1990. Zwischen Selektionsrichtung war keine Asymmetrie der realisierten genetischen Korrelationen zu erkennen, wohl aber scheint eine solche in Abhängigkeit des primären Selektionsmerkmals zu existieren. Selektion nach Milchmenge fü hrte zu deutlich stärkerer negativer Reaktion bei Gehalten als umgekehrt Selektion auf Fett-und Eiweißgehalt sich auf Menge auswirkte. Zwischen beiden Gehalten ist die Korrelation symmetrisch.

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Selection for High and Low Fatness in Swine: Correlated Responses of Various Carcass Traits

Cited by 35 publications

References 6 publications

Use of Carbohydrate and Fat as Energy Source by Obese and Lean Swine

Use of Carbohydrate and Fat as Energy Source by Obese and Lean Swine

Carcass characteristics of Southdown rams from high and low backfat selection lines

Asymmetric genetic correlations between dairy traits

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