The breed of dam by sex of calf interaction effect on beef cattle weaning weight and cow efficiency

1992 ◽  
Vol 72 (4) ◽  
pp. 981-985 ◽  
Author(s):  
C. A. Dinkel ◽  
D. M. Marshall ◽  
W. L. Tucker
Keyword(s):  
Beef Cattle ◽  
Sex Difference ◽  
Interaction Effect ◽  
Additional Data ◽  
Feed Utilization ◽  
Efficiency Ratio ◽  
Data Set ◽  
Weaning Weight ◽  
Key Words Weaning ◽  
Sources Of Variation

A portion of a data set reported on in a previous paper was combined with additional data to evaluate the effects of dam breed × calf sex interaction and other sources of variation on beef cattle weaning weight and cow–calf efficiency of feed utilization. Within the Angus × Hereford dam group, the sex difference (male minus female calf) was 8.4% for weaning weight and 8.1% for efficiency ratio (calf weaning weight divided by dam and calf total digestible nutrients). Within the Simmental × Hereford group, the sex difference was 15.5% for weaning weight and 12.3% for efficiency ratio. Key words: Weaning weight, cow efficiency, beef cattle

scholarly journals Selection of a suitable data set and model for the estimation of genetic parameters of the weaning weight in beef cattle

2007 ◽  
Vol 50 (6) ◽  
pp. 562-574
Author(s):  
L. Vostrý ◽  
J. Přibyl ◽  
Z. Veselá ◽  
V. Jakubec
Keyword(s):  
Beef Cattle ◽  
Fixed Effects ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Genetic Effect ◽  
Suitable Model ◽  
Data Set ◽  
Weaning Weight ◽  
Estimation Of Genetic Parameters ◽  
Selection Of

Abstract. The objective of this paper was to select a suitable data subset and statistical model for the estimation of genetic parameters for weaning weight of beef cattle in the Czech Republic. Nine subsets were tested for the selection of a suitable subset. The subsets differed from each other in the limit of sampling criteria. The most suitable subset satisfied these conditions: at least 5 individuals per each sire, 5 individuals per HYS (herd, year, season), 2 sires per HYS, and individuals per dams that have at least one half-sister and two offspring (n = 4 806). The selection of a suitable model was carried out from 10 models. These models comprised some of the random effects: direct genetic effect, maternal genetic effect, permanent maternal environment effect, HYS, sire × herd or sire × year interaction, and some of the fixed effects: dam’s age, sex (young bull, heifer × single, twin born), HYS, year, herd. The direct heritability (h2a) ranged from 0.06 to 0.17, of maternal heritability (h2m) from 0.03 to 0.06. The genetic correlations between the direct and maternal effect (ram) were in the range of –0.15 –0.42.

Factors affecting birth weight and performance to weaning of Bunaji calves

1988 ◽  
Vol 111 (2) ◽  
pp. 407-410 ◽  
Author(s):  
O. O. Oni ◽  
V. Buvanendran ◽  
N. I. Dim
Keyword(s):  
Birth Weight ◽  
Beef Cattle ◽  
Beef Cows ◽  
Genetic Differences ◽  
Economic Returns ◽  
Weaning Weight ◽  
Breeding Values ◽  
Factors Affecting ◽  
Sources Of Variation ◽  
And Performance

Birth weight and pre-weaning performance are recognized as important components in determing economic returns from beef cattle. The accuracy of ranking animals based on their breeding values, and hence the effectiveness of selection, will be increased when allowance is made for non-genetic sources of variation. Furthermore, the proper evaluation of identifiable sources of variation in calf weaning weight aids in more accurate appraisal of genetic differences in mothering ability among beef cows.

SOURCES OF VARIATION IN BEEF CATTLE WEANING WEIGHT

1990 ◽  
Vol 70 (3) ◽  
pp. 761-769 ◽  
Author(s):  
C. A. DINKEL ◽  
W. L. TUCKER ◽  
D. M. MARSHALL
Keyword(s):  
Energy Consumption ◽  
Beef Cattle ◽  
Total Energy ◽  
Least Squares ◽  
Milk Production ◽  
High Energy ◽  
The Other ◽  
Total Energy Consumption ◽  
Weaning Weight ◽  
Sources Of Variation

Milk production, body condition, body weight and individual feed records for 196 2-yr-old heifers and their calves were used to evaluate sources of variation in weaning weight and its two major components, total energy consumption for the year and efficiency of energy use, defined as weaning weight divided by total energy for cow and calf. Four breed groups of cows including 29 Hereford, 73 Simmental × Hereford, 68 Angus × Hereford and 26 Tarentaise × Hereford were represented over the 6-yr period. Long-horn bulls sired the calves in all but the first 2 yr when Angus bulls were used. Sources of variation were evaluated by fixed model least squares and multiple regression analyses. The least squares analysis indicated the Hereford and Angus × Hereford differed only in level of condition both at calving and at weaning, with the Angus cross slightly fatter. The Simmental cross was highest in calving condition and equal to the Angus in weaning condition. The Simmental and Tarentaise crosses were similar and significantly different from the other breed groups in milk production and weaning weight of first calves. The Tarentaise cross was different from the other three groups in cow weight at weaning, cow efficiency and condition at weaning. The Tarentaise cross and Hereford group had lowest total cow and calf energy consumption, with Simmental cross highest and Angus cross intermediate. The Simmental cross achieved a high weaning weight through high energy consumption and slightly above average efficiency, while the Tarentaise group utilized high efficiency along with low energy consumption. The breed of dam by sex of calf interaction was significant for cow efficiency which has some implication for efficiency experiments that depend on group feeding. Standard partial regressions indicated that year followed by cow condition at weaning and milk production were leading sources of variation in weaning weight and efficiency. Year and cow weight at weaning were leading sources for total energy consumption. Cow weight at weaning was of least importance in determining weaning weight and efficiency. Key words: Weaning weight, cow efficiency, energy consumption, beef cattle

Sire × herd interactions for weaning weight in beef cattle

1992 ◽  
Vol 70 (8) ◽  
pp. 2359-2365 ◽  
Author(s):  
D. R. Notter ◽  
B. Tier ◽  
K. Meyer
Keyword(s):  
Beef Cattle ◽  
Weaning Weight

scholarly journals 127 Predicting Dry Matter Intake of Gestating and Lactating Beef Cows

2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 58-58
Author(s):  
Megan A Gross ◽  
Claire Andresen ◽  
Amanda Holder ◽  
Alexi Moehlenpah ◽  
Carla Goad ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Milk Yield ◽  
Feed Intake ◽  
Beef Cows ◽  
Multiple Regression Equation ◽  
Validation Data ◽  
Data Set ◽  
Lactating Cows ◽  
Downward Bias ◽  
Protein Supply

Abstract In 1996, the NASEM beef cattle committee developed and published an equation to estimate cow feed intake using results from studies conducted or published between 1979 and 1993 (Nutrient Requirements of Beef Cattle). The same equation was recommended for use in the most recent version of this publication (2016). The equation is sensitive to cow weight, diet digestibility and milk yield. Our objective was to validate the accuracy of this equation using more recent published and unpublished data. Criteria for inclusion in the validation data set included projects conducted or published within the last ten years, direct measurement of forage intake, adequate protein supply, and pen feeding (no tie stall or metabolism crate data). The validation data set included 29 treatment means for gestating cows and 26 treatment means for lactating cows. Means for the gestating cow data set was 11.4 ± 1.9 kg DMI, 599 ± 77 kg BW, 1.24 ± 0.14 Mcal/kg NEm per kg of feed and lactating cow data set was 14.5 ± 2.0 kg DMI, 532 ± 116.3 kg BW, and 1.26 ± 0.24 Mcal NEm per kg feed, respectively. Non intercept models were used to determine equation accuracy in predicting validation data set DMI. The slope for linear bias in the NASEM gestation equation did not differ from 1 (P = 0.07) with a 3.5% positive bias. However, when the NASEM equation was used to predict DMI in lactating cows, the slope for linear bias significantly differed from 1 (P < 0.001) with a downward bias of 13.7%. Therefore, a new multiple regression equation was developed from the validation data set: DMI= (-4.336 + (0.086427 (BW^.75) + 0.3 (Milk yield)+6.005785(NEm)), (R-squared=0.84). The NASEM equation for gestating beef cows was reasonably accurate while the lactation equation underestimated feed intake.

Genetic variation of the weaning weight of beef cattle as a function of accumulated heat stress

2015 ◽  
Vol 133 (2) ◽  
pp. 92-104 ◽  
Author(s):  
M.L. Santana ◽  
A.B. Bignardi ◽  
J.P. Eler ◽  
J.B.S. Ferraz
Keyword(s):  
Genetic Variation ◽  
Heat Stress ◽  
Beef Cattle ◽  
Weaning Weight

Some Factors Affecting Feed Utilization in Growing Beef Cattle

1955 ◽  
Vol 14 (4) ◽  
pp. 970-978 ◽  
Author(s):  
George Nelms ◽  
Ralph Bogart
Keyword(s):  
Beef Cattle ◽  
Feed Utilization ◽  
Factors Affecting

Predicting lean meat yield in beef cattle using ultrasonic muscle depth and width measurements

2003 ◽  
Vol 83 (3) ◽  
pp. 429-434 ◽  
Author(s):  
R. Bergen ◽  
D. H. Crews ◽  
Jr., S. P. Miller ◽  
J. J. McKinnon
Keyword(s):  
Beef Cattle ◽  
Carcass Composition ◽  
Ultrasound Measurement ◽  
Independent Data ◽  
Data Set ◽  
Meat Yield ◽  
Lean Meat ◽  
Ultrasound Measurements ◽  
Width Measurements ◽  
Highly Correlated

The value of live ultrasound longissimus dorsi depth and width measurements as predictors of estimated carcass lean meat yield of steers (CARLEAN-S) and bulls (CARLEAN-B) was studied. In trial 1, equations were developed to predict estimated lean meat yield of steers (n = 116) from carcass weight (Eq. 1) or liveweight (Eq. 2), fat depth and l. dorsi area or liveweight, fat depth and l. dorsi depth × width (Eq. 3). Equation 1 was most precise (RSD = 25.6 g kg-1), followed by Eq. 2 (RSD = 27.8g kg-1) and Eq. 3 (RSD = 30.2g kg-1). Equations 2 and 3 predicted CARLEAN-S with similar accuracy (SEP = 23.8 vs. 24.9 g kg-1, respectively) and were highly correlated with each other (r = 0.89) in an independent data set (n = 118). Repeatability and accuracy of pre-slaughter l. dorsi depth and width measurements were studied in yearling bulls (trial 2; n = 191). When ultrasound measurements were expressed as a percentage of the average ultrasound measurement, repeatabilities of l. dorsi depth (SER = 6.2 to 7.8%) and width (SER = 4.2 to 6.1%) measurements were similar to fat depth and l. dorsi area measurements (SER = 17.9 and 4.5%, respectively). When ultrasound measurements were compared to the corresponding carcass measurements, l. dorsi depth (SEP = 10.3 to 13.9%) and width (SEP = 6.7 to 8.5%) measurements were as accurate as fat depth and l. dorsi area measurements (SEP = 32.9 and 8.4%, respectively). Equations were developed to predict CARLEAN-B of yearling bulls (n = 82) from liveweight, 12th rib ultrasound fat depth and either l. dorsi depth × width measurements (Eqs. 4 and 5) or two l. dorsi depth measurements (Eq. 6). All equations had similar precision (RSD = 19.4 to 19.5 g kg-1) and predicted CARLEAN-B similarly (SEP = 25.0, 24.6 and 26.1g kg-1 for Eqs. 4, 5 and 6, respectively) in an independent data set (n = 109). All equations were highly correlated (r ≥0.97) with an equation using ultrasound fat depth and l. dorsi area in the independent data set. Longissimus muscle depth and width measurements were as valuable as l. dorsi area for predicting carcass composition of yearling beef bulls in the present study. Key words: Ultrasound, beef cattle, carcass traits

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