The effects of selection for lean growth and the halothane allele on growth performance and mortality of pigs in a tropical environment

McPhee, C.P.; Daniels, LJ; Kramer, H.L.; Macbeth, G. M.; Noble, J. W.

doi:10.1016/0301-6226(94)90055-8

Cited by 17 publications

(5 citation statements)

References 8 publications

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“…On the other hand, the lack of a difference (p > 0.05) in the feed:gain ratio between NN and Nn animals disagrees with Leach et al (1996), but agrees with the results reported by McPhee et al (1994) and Miller et al (1999). Taken together, the lack of statistical differences in average daily gain and the feed:gain ratio indicates that the n allele does not influence these traits in pigs fed up to 65 kg of live weight.…”

Section: Discussionsupporting

confidence: 55%

“…The lack of statistical differences (p > 0.05) in average daily gain between NN and Nn animals disagrees with the results reported by Zhang et al (1992) and McPhee et al (1994), and is supported by Leach et al (1996), Miller et al (1999) and Jin et al (2002). On the other hand, the lack of a difference (p > 0.05) in the feed:gain ratio between NN and Nn animals disagrees with Leach et al (1996), but agrees with the results reported by McPhee et al (1994) and Miller et al (1999).…”

Section: Discussioncontrasting

confidence: 54%

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Relationship between the Porcine Stress Syndrome gene and carcass and performance traits in F2 pigs resulting from divergent crosses

et al. 2005

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The PSS genotypes of 596 F 2 pigs produced by initial mating of Brazilian native boars commercial sows and were characterized by PCR-RFLP and their carcass and performance traits were evaluated. Among the 596 animals analyzed, 493 (82.72%) were characterized as NN and 103 (17.28%) as Nn. With respect to carcass traits, Nn animals presented higher (p < 0.05) right half carcass weight, left half carcass weight, loin depth and loin eye area, and lower shoulder backfat thickness, backfat thickness between last and next to last but one lumbar vertebrae and backfat thickness after last rib at 6.5 cm from the midline compared to NN animals. Nn animals also showed (p < 0.05) higher values for most of the cut yields, indicating higher cutting yields for animals carrying the n allele and lower values for bacon depth, confirming lower fat deposition in carcass. In addition, Nn animals presented (p < 0.05) lower values for the performance trait weight at 105 days of age. These results indicate that animals carrying the PSS gene generate leaner carcasses, higher cut yields, and that the effects of the gene can be observed even in divergent crosses.

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Section: Discussionsupporting

confidence: 55%

Section: Discussioncontrasting

confidence: 54%

Relationship between the Porcine Stress Syndrome gene and carcass and performance traits in F2 pigs resulting from divergent crosses

et al. 2005

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“…The genotype difference in feed efficiency observed in the current study is equivalent to a saving of approximately 21 kg of feed/pig for pigs grown between 40 and 125 kg, which is of some commercial significance. McPhee et al (1994) also reported a feed efficiency advantage for carriers and reactors over negative pigs. In contrast, several other studies have shown no effect of the halothane gene on feed efficiency (Eikelenboom et al, 1980;Jensen and Barton-Gade, 1985).…”

Section: Resultsmentioning

confidence: 92%

The growth performance, carcass characteristics, and meat quality of halothane carrier and negative pigs.

Leach

Ellis

Sutton

et al. 1996

Journal of Animal Science

174

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Growth performance, carcass characteristics, and meat quality of halothane carrier (Nn) and negative (NN) pigs grown from 40 kg live weight and slaughtered at three weights (110, 125, and 140 kg live weight) were studied. Daily gains were similar for the two genotypes (974 g for Nn and 964 g for NN), but Nn pigs had a higher gain:feed ratio than NN pigs (P < .01). Dressing percentage was higher in Nn pigs than in NN pigs (P < .001), but there were no genotype differences for carcass length, backfat thickness, or loin eye area. Percentage yield of trimmed, boneless wholesale cuts was higher for Nn pigs than for NN pigs (P < .05). This resulted from higher trimmed, boneless ham, boston, and picnic weights (P < .05) in Nn than in NN pigs (6.9, 3.2, 3.5 kg vs 6.6, 3.0, 3.4 kg, respectively). The weight of fat-free lean was higher in Nn pigs (P < .05). The longissimus thoracis muscle from carrier pigs had lower 45 min (P < .001) and 24 h (P < .01) pH. Longissimus lumborum samples from carriers had lower (P < .001) subjective' meat quality scores and a higher drip loss (P < .001); however, cooking loss, eating quality, and shear force values were similar for the two genotypes. There were no important slaughter weight x genotype interactions for the traits reported. Overall, the data from this study suggest Nn pigs had an advantage over NN pigs in terms of feed efficiency, carcass yield fat-free lean content, and commercial lean cut yields but had a higher incidence of PSE.

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“…Feed efficiency on test did not differ between genotypes either, with differences between NN and Nn pigs ranging from –2 to –9 g of weight gain per kg of feed intake. Literature concerning feed consumption are scarce and contradictory, but there is some evidence that indicates that Nn pigs are more efficient in the conversion of feed (M C P HEE et al. 1994; L EACH et al.…”

Section: Resultsmentioning

confidence: 99%

A within‐breed comparison of RYR1 pig genotypes for performance, feeding behaviour, and carcass, meat and fat quality traits

Tör

Estany

Mata

et al. 2001

J Animal Breeding Genetics

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Data on 187 DNA-tested purebred Landrace pigs were used to compare heterozygous RYR1 genotypes (Nn) and normal homozygotes (NN) in performance (growth, fat deposition rate and feeding behaviour patterns), and carcass, meat and fat quality traits. From 75 to 165 days of age, live body weight (BW), ultrasonic midback (UMB) and loin (ULB) backfat measurements were recorded periodically on the same animal. Individual voluntary feed intake (DFI), number of visits (NVD) and feeding time (FTD) were measured on a daily basis using an automatic feeding system. Polynomial models with random regression coef®cients were used to describe BW, UMB, ULB, DFI, NVD and FTD as a function of age. Carcass, meat and fat quality traits were analysed using a mixed model with the RYR1 genotype as a ®xed effect. No signi®cant (p < 0.05) differences were observed between NN and Nn genotypes for growth, feed intake and feed ef®ciency at any age, but the NN pigs showed higher values for UMB and ULB (0.68 0.30 mm and 0.88 0.40 mm, respectively, at 165 days). The Nn pigs had higher predicted carcass lean content (+11.1 3.7 g/kg) and higher proportion of ham in the carcass (+2.9 1.4 g/kg). However, they showed lower values of pH measurements at 45 min post-mortem (±0.26 0.05 in M. longissimus dorsi, LD), and higher electrical conductivity at 45 min (+1.03 0.17 ls in LD) and 24 h post-mortem (+1.63 0.29 ls in LD). No signi®cant differences were found between genotypes for intramuscular fat in the M. semimembranosus (SM) and for fatty acid pro®les in the subcutaneous backfat and in the intramuscular fat of the SM. The results of this study suggest that Nn pigs would attain their maximum growth rate at later stages than the NN without any relevant change in the feeding behaviour pattern. Also they con®rm that Nn pigs are leaner, have greater proportion of high-priced cuts in the carcass and are more prone to develop pale, soft and exudative meats. However, no effect on fat quality traits was found. ZusammenfassungVergleich von RYR1-Genotypen innerhalb einer Schweinerasse in Bezug auf Fressverhalten sowie Merkmalen der Mastleistung und Schlachtko È rperqualita È t Zum Vergleich von heterozygoten RYR1-Genotypen (Nn) mit homozygoten Genotypen (NN) in Bezug auf Wachstum, Verfettung und Fressverhalten sowie der Schlachtko È rper-, Fleisch-und Fettqualita Èt wurden Daten von 187 auf DNA-Ebene getesteten, reinrassigen spanischen Landrasse-Schweinen verwendet. Zwischen dem 75. und 165. Lebenstag wurde in regelma Èûigen Absta Ènden das Lebendgewicht (BW), die Ru È ckenspeckdicke in der Mitte des Ru È ckens (UMB) sowie im Lendenbereich (ULB) mittels Ultraschall am gleichen Tier erfasst. Die individuelle Futteraufnahme (DFI), die Anzahl der Besuche (NVD) und die Fresszeit (FTD) wurden ta Èglich mittels eines automatischen Fu È tterungssystems registriert. Um BW, UMB, ULB, DFI, NVD und FTD als eine Funktion des Alters zu beschreiben, wurden polynome Modelle mit zufa Èlligen Regressionskoef®zienten verwendet. Schlachtko È rper-, Fleisch-und Fettqualita Èt wurd...

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The effects of selection for lean growth and the halothane allele on growth performance and mortality of pigs in a tropical environment

Cited by 17 publications

References 8 publications

Relationship between the Porcine Stress Syndrome gene and carcass and performance traits in F2 pigs resulting from divergent crosses

Relationship between the Porcine Stress Syndrome gene and carcass and performance traits in F2 pigs resulting from divergent crosses

The growth performance, carcass characteristics, and meat quality of halothane carrier and negative pigs.

A within‐breed comparison of RYR1 pig genotypes for performance, feeding behaviour, and carcass, meat and fat quality traits

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