Evaluation of Performance Test Results for A.I. Bulls

Lindstrøm, Ulf; Maijala, Kalle

doi:10.1080/00015127009433409

Cited by 12 publications

(4 citation statements)

References 16 publications

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“…The R 2 obtained for live weight with heart girth and natural length was 79 % which is very close to the one obtained in the study by Lindström and Maijala (1970) where the average Revalue obtained with the same traits was 81 % for both Ayrshire and Finncattle. Statistical significance: *P < 0.05, **P < 0.01, ***P < 0.001.…”

Section: Means Of Live Measurements By Experimentssupporting

confidence: 73%

“…2. Diagram of the measurements According to a study by Lindström and Maijala (1970) As these figures are compared with the ones of the 1-year olds presented in Table 6 it can be seen that the mean of the heart girth is here about 15 cm and the length about 14 cm larger than in the present study. Difference in height was only 3 cm.…”

Section: Means Of Live Measurements By Experimentsmentioning

confidence: 90%

“…In the study by Lindström and Maijala (1970) The relation between birth weight and 180-day weight is considerably stronger than between birth weight and 365-day weight. The correlation between growth from 60-days to 180-days, and from 180-days to 365-days is nonsignificant.…”

Section: Wholesale Cuts In Thementioning

confidence: 99%

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Estimation of carcass characteristics in young beef cattle

Ruohomäki¹

1975

AFSci

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In the present study the main objectives were to determine whether sufficiently accurate estimation of live weight, carcass weight and carcass composition with live measurements is possible, and whether an accurate estimation of carcass composition with any other procedure than total carcass dissection is possible. The material consisted of 205 1-year old steers and bulls and 174 bull calves. Within experiment each trait of each animal was corrected for age, breed and feeding with a correction factor obtained with the least squares method. In the stepwise regression analysis the results for both age groups were analysed separately. From live measurements the best estimators in both age groups were width of chest, heart girth and natural length. The most reliable predictor of meat quantity was carcass weight. Revalue was 96 % for both age groups. In estimation of meat percentage the Revalue obtained for the olds with cutting results of fore shanks was 56 %, the respective value for the 1-year olds was considerably lower. With 1-yearolds the carcass weight and some byproducts gave the highest estimations for the quantity and percentage of fat, R2 were 62 % and 50 % respectively, and for the 14-yearolds the kidney fats and the cutting results of flanks gave the highest estimations, R2 were 70 % and 59 % respectively. For the quantity and percentage of bone the R2 for the 1-yearolds obtained with cutting results of shanks were 68 % and 55 % respectively, and for the 14-year olds 82 % and 70 % respectively. When the cutting results of the fore and hind quarters were used as estimators the R2 obtained for all the traits were higher in both age groups than with any other estimator, R2 obtained with carcass quality scores remained lower.

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Section: Means Of Live Measurements By Experimentssupporting

confidence: 73%

Section: Means Of Live Measurements By Experimentsmentioning

confidence: 90%

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Estimation of carcass characteristics in young beef cattle

Ruohomäki¹

1975

AFSci

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“…VARO 1969, LINDSTRÖM & MAIJALA 1970, MAIJALA 1972, KOSSILA & LAMPILA 1974, RUOHOMÄKI 1981, OJALA 1982. In practice the data were collected from milk recording farms and farms specializing in fattening calves.…”

Section: Introductionmentioning

confidence: 99%

Genetical and environmental factors affecting slaughter traits in beef production experiments in field

Kenttämies

1983

AFSci

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A Growth Curve Analysis for Bulls Tested at Station

Liski

1987

Biometrical J

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SummaryData on 2712 bulls teatmi a t station were a n a l y d to study the effect of certain external variables on growth traita of bulls. Moat of the animals were Ayrshires (2136). Otherwise Finncattle bulls and Frisian bulls were involved. The testing covers the interval 60-386 days of age, although in part of the data the period is 30-365. Bulls were weighted every 30th day (between 1965 and 1970).or at the ages of 80 and 180 days, and thereafter every 30 days up to the age of 366 days (between 1971 and 1977). Also birth weight waa available for 1250 calves. Feeding and general treatment of bulls a t station waa aa uniform aa possible for all animals. Consequently it can be assumed that effecta of non-genetic factors on the growth traita of bulls are minimized.One of the objectives of this study waa to compare the growth curves for the three breeds. In our data measurementa a t certain time-pointa have dropped out during the c o m e of data collection.Therefore we study the influence. of deleting measurements. We also consider the problem of influential measurements a t both the deaign level and the inference level. Several types of growth curves are fitted to the data in order to find the most appropriate model.

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Evaluation of Performance Test Results for A.I. Bulls

Cited by 12 publications

References 16 publications

Estimation of carcass characteristics in young beef cattle

Estimation of carcass characteristics in young beef cattle

Genetical and environmental factors affecting slaughter traits in beef production experiments in field

A Growth Curve Analysis for Bulls Tested at Station

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