Life Cycle Efficiency of Beef Production: VII. Prediction of Cow Efficiency Ratios for Progeny Weaned and Slaughtered3

Davis, Michael; Rutledge, J. J.; Cundiff, L. V.; Gearheart, W. W.; Hauser, E. R.

doi:10.2527/jas1987.64150x

Cited by 5 publications

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“…The assessment of efficiency requires measurement of individual feed intake, which is unpractical under normal circumstances. An accurate predictor of the efficiency of the dam--offspring unit that does not require individual feed consumption data, would therefore be useful for estimating biological efficiency (Davis et al,1987).…”

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A preliminary assessment of predictive measures for the expression of weaning efficiency in sheep

Schoeman¹

2009

SA J. An. Sci.

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Weights and individual feed intake data of 30 Dorper crossbred ewes and their single-born lambs were collected from conception to weaning. The data were used to calculate actual weaning efficiency of the individual ewe-lamb units [AEFF = lamb weaning weighUDDMl (digestible dry matter intake) of both ewe and lamb x 1001. The accuracy of ewe weight (EW) as a predictor of lamb weight (LW) and of predictive weaning efficiency (eEFF = LWEW) as a predictor of AEFF were investigated. Best predictions were obtained when EW was raised to the power of 0.72 and 0.67, respectively. Gewigte en individuele voerinnamedata van 30 Dorper kruisings en hulle enkellinggebore lammers is vanaf konsepsie tot speen aangeteken. Die data is gebruik om ware doeltreffendheid van die individuele ooi-lam eenhede te bereken (wDoEL = LamspeengewigfuDMl (verteerbare drodmateriaalinname) van beide ooi en lam x 1001. Die akkuraatheid van ooigewig (OGb) as 'n voorspeller van lamgewig (LG) en van speendoeltreffendheid (VDOEL = LG/OGb) as voorspeller van WDOEL is ondersoek. Die beste voorspellings is verkry toe OG tot die mag van 0.72 en 0.67 onderskeidelik verhef is.

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confidence: 99%

“…Consequently, these ratios (e.g. ADG/W075 or weaning weight/Wo75) tue com-monly used as a means of calculating relative growth or weaning efficiency (Turner, 1959;Dinkel & Brown, 1978;Davis e/ al., 1983;1987).…”

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A preliminary assessment of predictive measures for the expression of weaning efficiency in sheep

Schoeman¹

2009

SA J. An. Sci.

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“…After calving, all dams were bred at each subsequent estrus. A more complete description of breeding procedures, diets and management practices was given by Davis et al (1983aDavis et al ( , 1984a.…”

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confidence: 99%

“…Alternative efficiency ratios used in this study are defined briefly in table 1. Assumptions and formulas used to estimate cow efficiency were discussed in the first and fourth reports of this series on life cycle efficiency of beef production (Davis et al, 1983a(Davis et al, , 1984b.…”

Section: Estimation Of Cow Efficiencymentioning

confidence: 99%

“…In analysis I, clams were assigned slaughter rates (number of slaughter progeny produced 3 per opportunity) equaling i~1 ki/6.15, where 6.15 is the expected total number of parities on a lifetime basis and k i values are weighting factors used to accumulate slaughter weights of progeny on a life cycle basis (Davis et al, 1983a). Slaughter rate was not considered in analysis II (the actual lifetime approach) because all dams in the second analysis produced three slaughter progeny.…”

Section: Correlations Of Efficiency Ratios Withmentioning

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Life Cycle Efficiency of Beef Production: VI. Relationship of Cow Efficiency Ratios for Progeny Slaughtered to Growth, Condition, Fertility and Milk Production of the Dam3

Davis¹,

Rutledge²,

Cundiff³

et al. 1985

Journal of Animal Science

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Weights and individual feed consumptions of 160 beef, dairy and beef • dairy darns and their progeny were used to estimate several measures of life cycle cow efficiency. Efficiency was expressed as the ratio of output to input, where output included relative values for slaughter weights, carcass weights and trimmed wholesale cut weights of progeny and weight of the dam, and inputs were pre-and postweaning feed consumption of progeny plus lifetime feed consumption of the dam. In the first approach, inputs and outputs were weighted by their probability of occurrence; probabilities were a function of the age distribution of the cow herd and calf crop percentage in a theoretical herd. The second approach involved dividing the sum

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Developing breeding objectives for australian beef cattle production

Ponzoni¹,

1989

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A sequential procedure for the development of breeding objectives for beef cattle improvement is presented. The procedure is general, and could be used for other types of domestic livestock. The development proceeds in four phases: (1) specification of the breeding, production and marketing system; (2) identification of sources of income and expenses; (3) determination of biological traits influencing income and expense; (4) derivation of the economic value of each trait, based on discounted gene flow methods. As an example, a breeding objective is developed for a pure breeding herd from which male calves are marketed at 9 months of age and surplus heifers are sold at 15 months of age. Situations examined included: (1) the effect of discounting on the breeding objective (income and expense per year v. discounting at 0, 5 and 10%); (2) the effect of ignoring the economic value for food intake in the objective; (3) the effect of inclusion of yearling weight or the deletion of calving date from the selection index. In general, correlations between objectives for discounting and income and expense per year were greater than 0·95, whereas correlations between indices were greater than 0·85. Setting food costs equal to zero shifted emphasis from reproduction to growth traits, with a consequent increase in food intake. The addition of yearling weight to the index caused a small increase in the accuracy of the index, whereas the deletion of calving date had a large effect, halving the accuracy of the index. The practical implications of the results are discussed.

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Life Cycle Efficiency of Beef Production: VII. Prediction of Cow Efficiency Ratios for Progeny Weaned and Slaughtered3

Cited by 5 publications

References 0 publications

A preliminary assessment of predictive measures for the expression of weaning efficiency in sheep

A preliminary assessment of predictive measures for the expression of weaning efficiency in sheep

Life Cycle Efficiency of Beef Production: VI. Relationship of Cow Efficiency Ratios for Progeny Slaughtered to Growth, Condition, Fertility and Milk Production of the Dam3

Developing breeding objectives for australian beef cattle production

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