Technical note: Evolution of exit velocity in suckling Brahman calves.

@article{Burdick2011TechnicalNE,
  title={Technical note: Evolution of exit velocity in suckling Brahman calves.},
  author={Nicole C Burdick and Bryan Joseph Agado and J C White and Kara J. Matheney and Don A. Neuendorff and David G. Riley and Rhonda C. Vann and Thomas H. Welsh and Ronald D. Randel},
  journal={Journal of animal science},
  year={2011},
  volume={89 1},
  pages={
          233-6
        }
}
The purpose of this study was to assess changes in exit velocity (EV) of Brahman calves from 21 d of age (DOA) to 56 d postweaning (231.30 ± 1.23 DOA). Spring-born calves (n = 308) from 2006 to 2008 were sired by 18 bulls. Exit velocity (m/s) was determined as the rate of speed of a calf traversing 1.83 m after being released from a working chute. Temperament score was determined as the average of EV and pen score 28 d before and at weaning (2006: 173 ± 2 DOA; 2007: 174 ± 2 DOA; 2008: 163 ± 2… 

Figures from this paper

Genetic parameters of three methods of temperament evaluation of Brahman calves.

There appears to be sufficient additive genetic variance for selective improvement of temperament characteristics in Brahman cattle.

Prenatal transportation stress alters temperament and serum cortisol concentrations in suckling Brahman calves.

Overall, suckling Brahman calves that were prenatally stressed were more temperamental and had greater circulating serum concentrations of cortisol than control calves.

Temperament Trait Changes in Japanese Black Cows Under Grazing and Confined Conditions

It is suggested that grazing enhances docility in cows with various experiences in different situations encountered in daily management.

Blood lactate and rectal temperature can predict exit velocity of beef feedlot steers

Comparison of temperament between feedlot steers and heifers and to confirm chute side measures of temperament relationship to physiological responses to stress indicated that blood lactate in combination with rectal temperature were strong candidates to predict exit velocity.

Use of random regression to estimate genetic parameters of temperament across an age continuum in a crossbred cattle population.

There appeared to be an increasing influence of permanent environmental effects and decreasing influence of additive genetic effects corresponding to increasing calf age for EV, and to a lesser extent for TS, as well as inheritance by accumulating environmental stimuli with increases in age.

Effects of temperament on growth, plasma cortisol concentrations and puberty attainment in Nelore beef heifers.

Exit velocity may serve as temperament selection criteria to optimize development of B. indicus replacement heifers and reduce growth, increased plasma cortisol concentrations and hindered puberty attainment compared to ADQ heifer.

1094 WS Relationship between current temperament measures and physiological responses to handling of feedlot cattle

Physiological measures taken chute side as potential markers for defining an animal’s temperament and potential predictor were evaluated and the top candidate model was plasma lactate in combination with body temperature to predict exit velocity.

Associations between response to handling and growth and meat quality in frequently handled Bos taurus beef cattle.

Temperament did not appear to relate to meat quality in this study of frequently handled Bos taurus genotypes, which is in contrast to other studies using different beef production systems.

The Influence of Temperament on Body Temperature Response to Handling in Angus Cattle

The results from this study suggest that temperament may be related to variation in SIH in cattle during handling, and time × temperament trait × sex interactions with the CS is not statistically significant.

References

SHOWING 1-10 OF 14 REFERENCES

Interrelationships among growth, endocrine, immune, and temperament variables in neonatal Brahman calves.

The conclusion is that measurement of exit velocity should be done nearer to the time of weaning than to birth, as measuring exit velocity as early in life as d 21 to 24 fails to accurately predict temperament at weaning in over 40% of Brahman calves.

Effects of acclimation to human interaction on performance, temperament, physiological responses, and pregnancy rates of Brahman-crossbred cows.

Results from this study indicate that acclimation did not affect cow temperament and physiological responses but did increase pregnancy rates of Braford cows during yr 1, and the probability of cows becoming pregnant during the breeding season during both years.

A new technique for measuring temperament in cattle.

There were no differences between Africander-cross and Africander -cross x Brahman-cross genotypes at either of the two ages, though there were large differences between sire progeny means within each of the genotypes, particularly at the younger age.

Feedlot cattle with calm temperaments have higher average daily gains than cattle with excitable temperaments.

Assessment of temperament of feedlot cattle in Colorado shows that cattle that were quieter and calmer during handling had greater average daily gains than cattle that became agitated during routine handling.

Eye white percentage as a predictor of temperament in beef cattle.

Results from this study indicate that percentage EW in cattle could be used as a quantitative tool with minimal equipment to assess temperament in beef cattle, providing an objective method for temperament selection.

Behavioral agitation during handling of cattle is persistent over time

Associations between temperament, performance and immune function in cattle entering a commercial feedlot

Behavioural, endocrine and immunological measures made at weaning or feedlot entry were examined for associations amongst them and with feedlot performance with a view to identifying predictors of