Genetic Analysis of Degree of Maturity

Fitzhugh, H. A.; Taylor, St C. S.

doi:10.2527/jas1971.334717x

Cited by 148 publications

(79 citation statements)

References 6 publications

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“…In other words, animals that were heavy at maturity tended to have a slower growth rate and be relatively smaller in BW at earlier ages. This finding is in agreement with reports by Fitzhugh and Taylor (1971) and Bathaei and Leroy (1998), and is important information for the transmission of more profitable traits for early lamb growth. Hossein-Zadeh (2015), in a study of Guilan sheep, found lowest values for the phenotypic correlations between a and k, but these were still negative according to our findings.…”

Section: Resultssupporting

confidence: 83%

Genetic parameters of traits associated with the growth curve in Segureña sheep

Lupi

León²,

Nogales

et al. 2016

Animal

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This paper studies the genetic importance of growth curve parameters and their relevance as selection criteria in breeding programmes of Segureño sheep. Logistic and Verhulst growth functions were chosen for their best fit to BW/age in this breed; the first showed the best general fit and the second the best individual fit. Live weights of 41 330 individuals from the historical archives of the National Association of Segureña Sheep Breeders were used in the analysis. The progeny of 1464 rams and 27 048 ewes were used to study the genetic and phenotypic parameters of growth curve parameters and derived traits. Reproductive management in the population consists in controlled natural mating inside every herd, with a minimum of 15% of the females fertilized by artificial insemination with fresh semen; with the purpose being the herd genetic connections, all herd genealogies are screened with DNA markers. Estimates of growth curve parameters from birth to 80 days were obtained for each individual and each function by the non-linear regression procedure using IBM SPSS statistics (version 21) with the Levenberg-Marquart estimation method. (Co)variance components and genetic parameters were estimated by using the REML/Animal model methodology. The heritability of mature weight was estimated as 0.41 ± 0.042 and 0.38 ± 0.021 with the logistic and Verhulst models, respectively, and the heritability of other parameters ranged from 0.41 to 0.62 and 0.37 to 0.61, with the models, respectively. A negative genetic correlation between mature weight and rate of maturing was found.

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Section: Resultssupporting

confidence: 83%

Genetic parameters of traits associated with the growth curve in Segureña sheep

Lupi

León²,

Nogales

et al. 2016

Animal

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“…The RGR can be considered as an approximation of the rate of maturity applied to a short period of time and corresponds to daily gain expressed as a proportion of live weight [13].…”

Section: Datamentioning

confidence: 99%

Inbreeding depression on beef cattle traits: Estimates, linearity of effects and heterogeneity among sire-families

Carolino¹,

Gama

2008

Genet. Sel. Evol.

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-Records from up to 19 054 registered cows and 10 297 calves in 155 herds of the Alentejana cattle breed were used to study the effects of individual (F i ) and maternal (F m ) inbreeding on reproductive, growth and carcass traits, as well as assessing the importance of non-linear associations between inbreeding and performance, and evaluating the differences among sire-families in the effect of F i and F m on calf weight at 7 months of age (W7M). Overall, regression coefficients of performance traits on inbreeding were small, indicating a minor but still detrimental effect of both F i and F m on most traits. The traits with the highest percentage impact of F i were total number of calvings through life and calf weight at 3 months of age (W3M), followed by longevity and number of calves produced up to 7 years, while the highest effect of F m was on W3M. Inbreeding depression on feed efficiency and carcass traits was extremely small and not significant. No evidence was found of a non-linear association between inbreeding and performance for the traits analyzed. Large differences were detected among sire-families in inbreeding depression on W7M, for both F i and F m , encouraging the possibility of incorporating sire effects on inbreeding depression into selection decisions.Alentejana / cattle / inbreeding depression / individual inbreeding / maternal inbreeding

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“…The degree of maturity was defined as: (slaughter weight/adult BW) × 100 (Fitzhugh and Taylor, 1971). The adult live BW for each species and breed was estimated as the average BW of adult male (58.2 ± 0.46 kg, n = 314) and female (45.1 ± 0.37 kg, n = 3201) sheep and male (57.7 ± 0.35 kg, n = 224) and female (44.6 ± 0.37 kg, n = 2206) goats belonging to the same flock and herds, respectively.…”

Section: Animals and Managementmentioning

confidence: 99%

Carcass composition and meat quality of equally mature kids and lambs1

Santos

Silva

Azevedo

2008

Journal of Animal Science

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Carcass composition and meat quality attributes of 55 suckling kids (27 males and 28 females) and 57 suckling lambs (28 males and 29 females) of Portuguese native breeds were investigated. These suckling kid and lamb meats are European meat quality labels produced according to "Cabrito de Barroso-PGI" and "Borrego Terrincho-PDO" specifications, respectively. Female kids were slaughtered at 9.1 ± 0.36 kg of BW, and male kids were slaughtered at 10.4 ± 0.37 kg of BW, corresponding to 20.1 and 17.7% of maturity, respectively. Female lambs were slaughtered at 8.6 ± 0.53 kg of BW, and male lambs were slaughtered at 9.9 ± 0.23 kg of BW, corresponding to 19.9 and 17.1% of maturity, respectively. At 24 h postmortem, various yield and quality measurements were collected. The left sides of the carcasses were dissected into muscle, subcutaneous fat, intermuscular fat, and bone. Final pH, instrumental color (L*, a*, b*), carcass measurements, and kidney knob and pelvic fat were also determined. Samples of LM were taken from the lumbar and thoracic cuts for intramuscular and meat quality determinations. At 72 h postmortem, a sample of LM was used for cooking losses and Warner-Bratzler shear force determination. Suckling lambs had greater dressing proportion than suckling kids (P < 0.01). Carcass fatness was not affected by species (P > 0.05), but females had greater kidney knob and pelvic fat proportion than males (P < 0.01). Lambs had greater proportions of the highly valued leg cut and lower proportions of shoulder, anterior rib, and neck cuts than kids. Dissection results indicated that kid carcasses had greater muscle content and lower dissected fat and bone than lambs. Kids had greater (P < 0.001) muscle ultimate pH value than lambs (5.8 ± 0.02 vs. 5.6 ± 0.02). Males had greater (P < 0.05) muscle ultimate pH value than females (5.7 ± 0.02 vs. 5.6 ± 0.02). The kid meat was significantly lighter (P < 0.05) and less yellow (P < 0.001) than the lamb meat. Kids presented less cooking losses (P < 0.001) than lambs, and shear force value was significantly greater (P < 0.01) in lamb meat. The kid meat had significantly more moisture (P < 0.001) and less intramuscular fat content (P < 0.001) than lambs. At this maturity stage, there were significant differences on both carcass and meat quality attributes of suckling kids and lambs, possibly due to inherent differences between species.

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Genetic Analysis of Degree of Maturity

Cited by 148 publications

References 6 publications

Genetic parameters of traits associated with the growth curve in Segureña sheep

Genetic parameters of traits associated with the growth curve in Segureña sheep

Inbreeding depression on beef cattle traits: Estimates, linearity of effects and heterogeneity among sire-families

Carcass composition and meat quality of equally mature kids and lambs1

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