Carcass and Empty Body Composition of Hereford and Angus Bulls From Lines Selected for Rapid Growth on High-Energy or Low-Energy Deits

Bailey, C. B.; Lawson, J. E.

doi:10.4141/cjas89-070

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Other RIA components were: NIH-GH-BI8 reference standard (0.81 IU mg-r), rabbitantibovine GH (Lot 3-28-VII supplied by the late Dr. L Geschwind, University of California, Davis, CA), goatantirabbit gamma globulin and rabbit immunoglobulin (G 8-2 SA and AgR-30, respectively, Antibodies Incorporated, Davis, CA (Winer 1962) (Bailey and Lawson 1989a), carcass evaluation and composition (Bailey and Lawson 1989b), and blood composition and its relation to gain (Bailey et al 1990) have been published. The presentpaper details the relationship between GH kinetics and gain in these calves.…”

Section: Gh Assaymentioning

confidence: 99%

Effect of selection for feedlot gain, breed and age on growth hormone and growth hormone kinetics in bull calves

Mears¹,

Kozub²

1995

Can. J. Anim. Sci.

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sur les facteurs qui commandent le taux de croissanle. Les veiux Hereford 6taient plus lourds (P <.0,01) a Ia naissance mais les deux races manifestaient un GMQ comparable (P > 0,05) entre la mise base ei le poids corporel.de 450 kg. Dans chaque race, le GMe global 6tait positivemJnt coirdl€ (P < 0,0i) avec le poids ir la naissance. L'alimentation en cours de s6lection n,avait pas d'effet (f > O,bS) sur le GMQ, sur la GH basale, ni sur le volume constant de rdpartition (V,"), la demi-vie (T'r)' le taux de clairance m6taboiique (TCM) et le taux de secr6tion (TS) de I'hormone de croissance. Par comparaison avec les Hereford, les veaux Angus d6montraient un TCM et un TS plus 6lev6s (iespectivement P < 0,05 et P < 0,1), ind6pendamment du r6gime alimentaire en cours de s6lection et une GH basale plus basse (F < 0,05) dans la souche s6lectionn6e pour I'engraissement aux concenrr6s.LaGHbasale(P < 0,01), leT,,r(P i O,OS), IeTCM(P < 0,01)etleTS(P < 0,01).diminuaientg6n6ralement en fonction de I'accroissement du poids vifefa'e I'age dei veaux. Le taux de GH basale et les parambtres de cin6tique n'dtaient corr6l6s avec le GMe que dans qu.lqu" cas seulemeit, principalement entre la mise bas et le poids corporel de

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Section: Gh Assaymentioning

confidence: 99%

Effect of selection for feedlot gain, breed and age on growth hormone and growth hormone kinetics in bull calves

Mears¹,

Kozub²

1995

Can. J. Anim. Sci.

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“…Equations evaluated to predict carcass chemical composition assuming carcass water is known in the Carcass dataset [ 21 , 22 , 33 , 36 ]; Table S4. Equations evaluated to predict empty body chemical composition assuming carcass chemical composition is known in the Empty Body-Carcass dataset [ 21 , 22 ]; Literature used to construct the Weight Dataset [ 64 , 66 , 67 , 68 , 70 , 73 , 85 , 86 , 87 , 99 , 100 , 101 , 102 , 103 , 104 , 105 , 106 , 107 , 108 , 109 , 110 , 111 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 , 120 , 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 , 131 , 132 , 133 , …”

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confidence: 99%

Assessment of Equations to Predict Body Weight and Chemical Composition in Growing/Finishing Cattle and Effects of Publication Year, Sex, and Breed Type on the Deviation from Observed Values

Lancaster

2022

Animals

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Body weight and chemical composition are important aspects of beef cattle nutrition and management; however, existing equations estimating relationships among empty body and carcass chemical components were developed over 40 years ago using different cattle genetics and production systems. The objective of this analysis was to evaluate existing equations in predicting empty body and carcass chemical composition and determine the effect of sex, breed type, and publication year. A dataset was developed from published literature that contained 388 treatment means from 46 studies published between 1970 and 2020. Two equations relating shrunk body weight (SBW) to empty body weight (EBW), and 8 equations relating EBW and hot carcass weight (HCW) were found in the literature and evaluated using the developed dataset. Three sets of equations relating empty body chemical components, 4 sets of equations relating carcass chemical components, and 2 sets of equations relating carcass with empty body chemical components were found in the literature and evaluated using the dataset. Precision and accuracy of the equations were evaluated by simple linear regression of observed on predicted values, mean bias (MB), and concordance correlation coefficient (CCC). Additionally, the fixed effects of publication year, sex, and breed type on the deviation from observed values were evaluated using a general linear model. Both equations relating SBW to EBW and all equations relating EBW to HCW had high precision, but accuracy varied from −3.22 to −0.11% and −9.35 to −3.73% MB, respectively, and all the equations were affected by sex and breed type with 8 out of the 10 equations affected by publication year. For prediction of empty body chemical composition assuming empty body water is known, the 3 sets of equations varied in precision for protein (0.18 to 0.46), but not for fat (0.88 to 0.96) or ash (0.06 to 0.13) based on CCC, although the precision of prediction of protein and ash were poor. Accuracy of the 3 sets of equations varied for predicting empty body fat, protein, and ash with MB of −19.73 to −3.81, 1.67 to 15.91, and −0.16 to 15.75%, respectively. All 3 sets of equations were affected by publication year and breed type for predicting empty body fat, protein, and ash, and by sex for ash. For prediction of carcass chemical components assuming carcass water is known, the precision was similar among the 4 sets of equations for predicting fat (0.92 to 0.95), protein (0.34 to 0.40), and ash (−0.02 to −0.01) based on CCC, although precision was poor for protein and ash, but accuracy varied for prediction of carcass fat, protein and ash with MB of −11.20 to −2.52, 2.72 to 8.92, and −4.66 to 20.12%, respectively. Publication year and breed type affected the prediction of carcass fat and protein, and publication year, sex, and breed type affected the prediction of carcass ash for all 4 sets of equations. The precision of predicting empty body chemical components assuming carcass chemical components are known was high for water (0.96 and 0.98), fat (0.97 and 0.98), protein (0.97 and 0.97), and ash (0.98 and 0.96) and similar between the 2 sets of equations based on CCC. The accuracy of predicting empty body water (−1.68 and −0.33%), fat (6.38 and 2.70%), protein (0.85 and −0.54%), and ash (−0.65 and −4.54%) was moderate to high, but differed between sets of equations for fat and ash. Publication year influenced the prediction of empty body water for both sets of equations and ash for one of the equations, whereas, breed type influenced the prediction of water, protein, and ash, but not fat for both equations. Overall, existing equations may have major limitations to predicting empty body protein and ash unless carcass protein and ash are known. Additionally, all the equations were affected by some combination of publication year, sex, and breed type for one or more chemical components. Thus, a more robust set of equations should be developed to account for sex, breed type, and more recent cattle genetics and management systems.

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Rate and Efficiency of Gain, From Weaning to Slaughter, of Steers Given Hay, Hay Supplemented With Rumtnal Undegradable Protein, or Concentrate

Bailey¹

1989

Can. J. Anim. Sci.

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Holstein steers were given milk from birth until they reached a weight of 100 kg.Beginning at 60 kg, they received gradually increasing amounts of one of three different diets and these became their sole diet after milk was withdrawn. The three diets were: (a) 85% grass hay and 15% concentrate (group 1); @) the same diet with enough rumen undegradible protein (formaldehyde-treated canola meal) added to raise the crude protein content by l0 g kg-r (group 2); arrd (c) 85% concentrate and l5Va grass hay (group 3). The amounts of the three diets offered were designed to provide 0. ind of empty body protein, fat, and energy, were greater in steers in group 3 than in those in group 1. The extra gain of group 3 steers, compared with group I steers, was due largelyto gain of extra body fat. The overall efficiency of energy gain was 5O% greater in steers in group 3 than in those in group 1. Supplementing the forage diet (group 1) with rumen undegradable protein (group 2) increased daily empty liveweiglit gains by 13% and reduced the extra-maintenance energy requirement per unit weight gain bi 12% . Daily gains of carcass muscle, bone, and protein, and of empty body protein, were greater in steers in group 2 than in those in group 1. The extfa gain ofgroup 2 steers, compared with group I steers, was due largely to gain ofextra body protein and its associated water. There were no differences between steers in these two groups in efficiency of energy gain (energy gain per unit extra-maintenance energy intake). It was concluded that the higher energetic efficiency of empty body weight gain of steers in group 2, as opposed to those in group 1, was due to a higher ratJof net protein synthesis as a consequence of the increased amounts of protein absorbed from the intestine, and that the higher energetic efficiency of weight gain of steers given the concentrate diet (group 3), as opposed to those given the forage diet (group 1), was due to a higher efficiency of conversion of the energy-yielding products of digestion into fat.

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Carcass and Empty Body Composition of Hereford and Angus Bulls From Lines Selected for Rapid Growth on High-Energy or Low-Energy Deits

Cited by 3 publications

References 21 publications

Effect of selection for feedlot gain, breed and age on growth hormone and growth hormone kinetics in bull calves

Effect of selection for feedlot gain, breed and age on growth hormone and growth hormone kinetics in bull calves

Assessment of Equations to Predict Body Weight and Chemical Composition in Growing/Finishing Cattle and Effects of Publication Year, Sex, and Breed Type on the Deviation from Observed Values

Rate and Efficiency of Gain, From Weaning to Slaughter, of Steers Given Hay, Hay Supplemented With Rumtnal Undegradable Protein, or Concentrate

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