Weaning Weight Correction Factors from Angus Field Data

1978 ◽  
Vol 47 (1) ◽  
pp. 124-130 ◽  
Author(s):  
J. H. Anderson ◽  
R. L. Wilham
Keyword(s):  
Field Data ◽  
Correction Factors ◽  
Weaning Weight ◽  
Weight Correction

Effects of sex and some environmental factors on weaning weight in sheep

1976 ◽  
Vol 16 (78) ◽  
pp. 19 ◽  
Author(s):  
KP Ransom ◽  
PD Mullaney
Keyword(s):  
Environmental Factors ◽  
Regression Coefficients ◽  
Correction Factors ◽  
Weaning Weight ◽  
Efficient Selection

The effects of age at weaning, type of birth and rearing, age of dam and sex on weaning weight of lambs were investigated among 4876 Merino and 1221 Poll Dorset lambs over two years on 11 properties in Victoria. The regression coefficients of weaning weight on age at weaning varied considerably between properties. Lambs born and reared as twins were about 15 per cent lighter at weaning than single lambs, and lambs born as twins and reared as singles had about half the handicap. The average weaning weight of lambs increased with age of ewe up till five years and declined thereafter. Corrections to weaning weight for these effects are required for efficient selection. These corrections vary between years and properties. In most flocks there are inadequate numbers of sheep to determine accurate correction factors for each property each year and so standard corrections must be used.

Sire × Environment Interactions in Beef Cattle Weaning Weight Field Data

1985 ◽  
Vol 60 (6) ◽  
pp. 1396-1402 ◽  
Author(s):  
J. K. Bertrand ◽  
P. J. Berger ◽  
R. L. Willham
Keyword(s):  
Beef Cattle ◽  
Field Data ◽  
Weaning Weight

Additive Versus Multiplicative Correction Factors for Weaning Weight in Beef Cattle

1966 ◽  
Vol 25 (4) ◽  
pp. 983-987 ◽  
Author(s):  
L. V. Cundiff ◽  
R. L. Willham ◽  
Charles A. Pratt
Keyword(s):  
Beef Cattle ◽  
Correction Factors ◽  
Weaning Weight

The effect of correction factors on response to selection in beef cattle

1980 ◽  
Vol 30 (2) ◽  
pp. 211-216 ◽  
Author(s):  
L. P. Jones ◽  
I. R. Hopkins
Keyword(s):  
Growth Rate ◽  
Age Groups ◽  
Correction Factors ◽  
Response To Selection ◽  
Weaning Weight ◽  
Selection For ◽  
Rate Selection ◽  
Genetic Responses ◽  
Selection Differentials ◽  
Selection Of

ABSTRACTProgeny of younger dams grow more slowly than those of older dams. When the environmental effects of dam age are not allowed for in selection for growth rate, selection differentials and genetic responses to selection are reduced.In a model herd, with cows aged 2 to 8 years, it was found that neglecting the dam age effects reduced genetic gains by about 15% when selection is for weaning weight, and by 11 to 7 % when selection is at an age of 12 to 20 months. Much of the reduction occurs because of the selection of higher proportions from genetically inferior groups.If genetic differences among dam age groups are small the reduction is only 7% at weaning and less at older ages. The effect of ignoring calf age was also estimated. It was found that if calves born within a period of 33 days were compared and calf age was neglected, the response to selection for weaning weight would be reduced by about 6%.

scholarly journals Aminoglycoside dosing weight correction factors for patients of various body sizes

1995 ◽  
Vol 39 (2) ◽  
pp. 545-548 ◽  
Author(s):  
A. M. Traynor ◽  
A. N. Nafziger ◽  
J. S. Bertino
Keyword(s):  
Correction Factors ◽  
Body Sizes ◽  
Weight Correction

Effect on production records of sex of lamb, twinning, and dam's age in a grassland flock

1962 ◽  
Vol 4 (3) ◽  
pp. 369-377 ◽  
Author(s):  
H. P. Donald
Keyword(s):  
Birth Weight ◽  
Correction Factors ◽  
Weaning Weight

The effects of sex, twinning and age of ewe on birth weight, weaning weight and fertility have been studied in 5 years' records of a small grassland flock of Wiltshire × Blackface crossbred ewes with the object of providing provisional correction factors for these variables in recorded flocks under similar management. All these variables produced large effects in the flock studied. On birth weight these were; sex, 0·6 lb.; twinning, 2·1 lb.; hogg's lamb, 2·3 lb. The corresponding adjustments for weaning weight were 7 lb., 14 lb., and 11 lb. Ewes first bred as hoggs subsequently performed well.

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