Genetic Analysis of Economic Characteristics of Young Hereford Cattle

Blackwell, R. L.; Knox, J. H.; Shelby, C. E.; Clark, R. T.

doi:10.2527/jas1962.211101x

Cited by 16 publications

(30 citation statements)

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“…The heritability value for 1080 4610 3640 dressing percentage is higher than the value of 0-05 found by Mason (1964) for dual purpose cattle. It agrees with the value of 0-25 found by Blackwell, Knox, Shelby and Clark (1962) for beef cattle, but lies between the values of 0-01 and 0-73 reported respectively by Knapp and Clark (1950) and by Shelby, Clark and Woodward (1955) also for beef cattle. The heritability of rate-ofgain found in this study accords well with the heritabilities found in beef cattle studies (Knapp and Nordskog, 1946;Knapp and Clark, 1950;Blackwell et ah, 1962;Shelby et ah, 1955), but is considerably higher than that found in other studies on Israeli data of this sort (Bar-Anan, Angel and Soller, 1962;Soller, Bar-Anan and Shilo, 1966) and by Mason (1964).…”

Section: Tablesupporting

confidence: 91%

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The effect of age, live-weight and rate-of-gain on dressing percentage and non-saleable fat content of Israel-Friesian bull calves

1967

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BULL calves from the dairy herd are an important source of beef in Israel and other countries. The present investigation, based on field data, was carried out in order to determine the effect of management practices, intended to increase bull calf live-weight, on the dressing percentage and non-saleable fat content of the animals. In addition, the data enabled estimates of the heritability of live-weight rate-of-gain, carcass rate-of-gain, and dressing percentage to be obtained, and the genetic correlation between carcass weight and live-weight to be calculated. The genetic correlation between liveweight and carcass weight is of interest in determining the extent to which selection on the basis of live-weight, which is easily measured, will be reflected in increased carcass weight. DATA AND METHODSThe data on which this study was based consisted of the live-weights, ages, and warm carcass weights after quartering, of 525 Israel-Friesian bull calves, slaughtered between 1 January 1961 and 1 June 1962. Carcass weight did not include non-saleable fat. Only groups of four or more calves that came to the slaughter house at the same time from the same farm were included in this study. The calves in such groups were generally raised together from birth and will be referred to as a 'lot'. There were 83 such lots from 46 different farms, including offspring of 26 sires. The age of the calves at sale ranged from 12 to 16 months, and their live-weights from 380 to 530 kg. For 225 of these calves (in 37 lots) weight of non-saleable ruminal fat was also available. For varying numbers of these animals the weights of non-saleable kidney fat, inguinal fat and scapular fat were also obtained.Live-weight was based on one weighing at the farm on the morning of sale before feeding but without a preliminary fasting period and with access to water. The reliability of a single weighing under these conditions was estimated by three consecutive morning weighings of 51 bull calves not otherwise included in this study. The possibility of using ruminal fat as an indicator of total non-saleable fat was investigated by calculating the correlation and regression of non-saleable fat on ruminal fat from data on 43 animals for which total non-saleable fat was available, and an additional 59 animals for which data on ruminal, kidney, and inguinal but not scapular fat were available.In the context of this paper, non-saleable fat refers to the hard fat found surrounding the rumen, the kidney, and in the inguinal and scapular regions.Live-weight rate-of-gain was taken as the live-weight (in g.) less an

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Section: Tablesupporting

confidence: 91%

“…A value of 1-15 has previously been reported for beef cattle by Blackwell et al (1962). (Values above 1-0 for the genetic correlation are occasionally obtained as a result of sampling variation about a true value close to 1 -0.)…”

Section: Tablementioning

confidence: 92%

The effect of age, live-weight and rate-of-gain on dressing percentage and non-saleable fat content of Israel-Friesian bull calves

1967

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“…In their review Utrera et al (2004) stated that in literary sources there existed a high variability among the estimated coefficients of heritability. The values ranged from 0.09 (Johnson et al, 1992) to 0.92 (Blackwell et al, 1962). The average value of heritability coefficients in literature was 0.42 (Utrera et al, 2004).…”

Section: Resultsmentioning

confidence: 96%

Linear and linear-threshold model for genetic parameters for SEUROP carcass traits in Czech beef cattle

Veselá¹,

Vostrý²,

Šafus³

2011

CZECH J ANIM SCI

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The objective of this study was to estimate genetic parameters for the results of classifying of carcass traits by the SEUROP method in beef cattle in the Czech Republic using linear and linear-threshold models. Genetic parameters were calculated and evaluated in a set of 4276 animals of eleven beef breeds and crosses with dairy and dual-purpose breeds (Aberdeen Angus – 1376, Hereford – 994, Simmental – 651, Charolais – 524, Piemontese – 185, Galloway – 162, Blonde d’Aquitaine – 147, Limousine – 106, Highland – 53, Gasconne – 44, Belgian Blue – 34) in 2005–2008. Aberdeen Angus, Hereford, Charolais and beef Simmental were the most numerous breeds. Fixed effect of a classifier, fixed regression on age at slaughter by means of Legendre polynomial of the second degree separately for the each breed and sex and fixed regression on heterosis coefficient were included in a model equation. Genetic parameters were estimated by a multi-trait animal model using a linear model and a linear-threshold model in which carcass weight (CW) was considered as the linear trait and carcass conformation (CC) and carcass fatness (CF) grading as threshold traits. The heritability coefficient for CW differed only moderately according to the method of the genetic parameter estimation (0.295 in linear model and 0.306 in linear-threshold model). The heritability coefficient for CC was 0.187 in linear model and 0.237 in linear-threshold model. The heritability coefficient for CF grading was 0.089 in linear model and 0.146 in linear-threshold model. Genetic correlation between CW and CC was high (0.823 in linear model and 0.959 in linear-threshold model), the correlation between CW and CF was intermediate (0.332 and 0.328, respectively) and it was low between CF and CC (0.071 and 0.053). If CW was included in the model equation as fixed regression using Legendre polynomial, lower heritability coefficients for CC (0.077 and 0.078) and CF (0.086 and 0.123) were calculated and the correlation between CC and CF was negative (–0.430 and –0.429).

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“…Shelby et al (1963) reported a heritability of .70 for slaughter weight and Christians et al (1962) estimated a heritability of 1.00. Blackwell et al (1962) analyzed final weight at the end of the fattening period and this estimate was .70. Lamb et al (1990) reported .41 from Hereford bulls.…”

Section: Resultsmentioning

confidence: 99%

“…Several studies have estimated genetic parameters for beef cattle and evaluated relationships between growth traits and carcass traits (Blackwell et al, 1962;Shelby et al, 1963;Cundiff et al, 1964;Swiger et al, 1965;Cundiff et al, 1971; Dinkel and Busch, 1973;Koch, 1978;Koch et al, 1982). However, all previous estimates were from herds that had been subjected to artificial selection.…”

Section: Introductionmentioning

confidence: 99%

Paternal half-sib heritabilities and genetic, environmental, and phenotypic correlation estimates from randomly selected Hereford cattle

Veseth

Reynolds

Urick

et al. 1993

Journal of Animal Science

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Growth and carcass data were collected during 10 yr at the Fort Keogh Livestock and Range Research Laboratory in Miles City, MT from a Hereford herd selected at random. The objective was to compare genetic parameter estimates from this randomly selected herd with estimates from published selection studies. Only bulls were included in the data set. Bulls were slaughtered between 14 and 17 mo of age. Genetic parameters were estimated by the paternal half-sib procedure. Data were subdivided into three subgroups: 1) all bulls that had birth weights, 2) bulls with complete records for growth traits, and 3) bulls with complete carcass and growth records. The heritability estimate for birth weight on 736 progeny from 86 sires was .18. The second group included 616 progeny representing 85 sires and heritability estimates were weaning weight, .17; daily gain from birth to weaning, .20; final test weight, .42; and daily gain on test, .47. The third group included 401 progeny from 75 sires and heritability estimates were carcass weight, .38; longissimus muscle area, .51; marbling, .31; slaughter weight, .42; and dressing percentage, .25. Thus, these estimates of heritability were in quite good agreement with previously published values, with a tendency for these estimates to be lower for early growth weights. Phenotypic and environmental correlations were in good agreement and genetic correlations were in general agreement with the data reviewed. Estimates of heritabilities from this herd selected at random were not larger than previous estimates from selected herds.

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Genetic Analysis of Economic Characteristics of Young Hereford Cattle

Cited by 16 publications

References 0 publications

The effect of age, live-weight and rate-of-gain on dressing percentage and non-saleable fat content of Israel-Friesian bull calves

The effect of age, live-weight and rate-of-gain on dressing percentage and non-saleable fat content of Israel-Friesian bull calves

Linear and linear-threshold model for genetic parameters for SEUROP carcass traits in Czech beef cattle

Paternal half-sib heritabilities and genetic, environmental, and phenotypic correlation estimates from randomly selected Hereford cattle

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