Effects of 84-, 112- and 140-day postweaning feedlot performance tests for beef bulls.

Brown, A.H.; Chewning, J. J.; Johnson, Z. B.; Loe, W. C.; Brown, C. J.

doi:10.2527/1991.692451x

Cited by 17 publications

(11 citation statements)

References 13 publications

(17 reference statements)

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“…The foregoing result is supported by the findings of Kemp [8] and Brown et al [9]. Some ones recommend a duration period for growth rate measurement in different literatures including 70 d [6], 84 d [7] and 112 d [8,9].…”

Section: Discussionsupporting

confidence: 77%

“…Some ones recommend a duration period for growth rate measurement in different literatures including 70 d [6], 84 d [7] and 112 d [8,9]. The studies recommended 112 d generally on the basis of phenotypic correlations with a 140-day test, and while do not consider problems with auto correlation data, those recommended a shorter tests (70-84 d) based on variation of components.…”

Section: Discussionmentioning

confidence: 99%

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Meat Production through Evaluation of Stallion Prospects for Simmental and Simbrah Cattle

Manzanares-Miranda¹,

Villalón-Mendoza²,

Degollado³

et al. 2015

JAST-A

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Abstract:In the world, many research has been made to increase the quality and quantity of food production, and also to seek increase of accessibility of consumption for the population, especially in low economic income communities, where the consumption of protein may be very important for public health and sustainable development. The main objective of this study was to generate knowledge to increase food safety in the production of meat through the assessment of cattle that are prospect to be stallions of the Simmental and Simbrah breeds. This took place in Linares, Nuevo Leon, Mexico. The period of time for the test to get accurate data regarding food consumption in this study was 70 d. The Simmental breed surpasses the Simbrah breed, with respect to increase in daily weight and increase in final weight (P ≤ 0.05). If Northeast México is looking to enhance food safety through a higher increase in final weight, then it should consider the Simmental breed as the most appropriate.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Meat Production through Evaluation of Stallion Prospects for Simmental and Simbrah Cattle

Manzanares-Miranda¹,

Villalón-Mendoza²,

Degollado³

et al. 2015

JAST-A

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“…Another implication is that the duration of performance test may be shortened and still provide reliable estimates of genetic differences. Similarly, recommendations have been made to shorten the length of the performance testing period for American beef bulls (Brown et al, 1991) and Japanese Wagyu bulls (Sasaki et al, 1982) without affecting rank for genetic merit. In contrast, Olson et al (1976) reported small genetic correlations for ADG between adjacent periods in post-weaning growth trials in ram lambs.…”

Section: Resultsmentioning

confidence: 99%

Effect of duration of performance test on variance component estimates for lamb growth rate

Snowder¹,

Vleck²

2002

Journal of Animal Science

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ABSTRACT:The objective was to determine the effect of periods of adjustment and duration of performance test on estimating genetic variance parameters for ADG. Variance components were estimated from ADG data collected from 1978 to 1984 on a total of 1,047 Targhee ewe and ram lambs at the U.S. Sheep Experiment Station (Dubois, ID). Across all years, lambs averaged 84 ± 9 d of age and 25 ± 5.4 kg of weight when placed on test. Lambs were provided ad libitum access to a commercial pellet of barley grain and ground alfalfa for 14 wk. Every 2 wk, ADG was recorded. Overall mean ADG for the entire 14-wk period across all years was 249.3 ± 56.5 g. Variance components were estimated from a single-trait animal model using REML for cumulative combinations of time on feed in 2-wk intervals from 4 to 14 wk and varying the adjustment period from 2 to 6 wk. The model included fixed effects for year (1978 to 1984), sex of lamb (ewe or ram), and genetic line (selected or control), and two covariates (age and weight at beginning of performance test). As

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“…There are many studies relating the duration of performance tests for growth rate and feed conversion ratio or its reciprocal in bulls (Brown et al 1991;Liu and Makarechian 1993). However, there are few studies (Archer et al 1997;Archer and Bergh 2000) …”

Section: Mots Clésmentioning

confidence: 99%

“…Those recommendations were based on phenotypic and genetic correlations, and efficiency of selection. If the testing time can be shortened while maintaining the same degree of accuracy, by correctly classifying animals into their respective (positive or negative) RMEI categories with minimal rank changes, then on-test feeding costs may be reduced.There are many studies relating the duration of performance tests for growth rate and feed conversion ratio or its reciprocal in bulls (Brown et al 1991;Liu and Makarechian 1993). However, there are few studies (Archer et al 1997;Archer and Bergh 2000) …”

mentioning

confidence: 99%

Residual metabolizable energy intake and its association with diet and test duration

Goonewardene¹,

Okine²,

Wang³

et al. 2004

Can. J. Anim. Sci.

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, T. 2004. Residual metabolizable energy intake and its association with diet and test duration. Can. J. Anim. Sci. 84: 291-295. The objective was to determine if end-of-test residual metabolizable energy intake (RMEI) is correlated with RMEI values calculated earlier in the test on steers fed two forage (silage) or four forage-grain diets. As the days on test increased the variation in RMEI decreased in all diets. In all but the 85% alfalfa + 15% barley grain diet, test duration for RMEI may be reduced from 105 to 84 d. In the 100% alfalfa silage diet, it may be further reduced from 105 to 63 d (Spearman r = 0.90; Pearson r = 0.94; P < 0.01). The duration of testing required to obtain reliable estimates of RMEI may therefore also depend on the type of diet being fed. Les auteurs ont utilisé pour cela des bouvillons nourris avec deux sortes de rations fourragères (ensilage) ou quatre mêlant fourrages et céréales. Quand le nombre de jours de l'essai augmente, la RMEI varie moins pour toutes les rations. On peut toujours réduire la durée du test de 105 à 84 jours sauf pour la ration contenant 85 % de luzerne et 15 % d'orge. Quand la ration ne renferme que de l'ensilage de luzerne, on peut diminuer la durée du test à 63 jours (r = 0,90 selon la méthode Spearman; r = 0,94 selon la méthode Pearson; P < 0,01). La durée de l'essai requise pour obtenir une estimation fiable de la RMEI pourrait donc varier avec le genre de ration fournie aux animaux. Mots clés:Ingestion d'énergie métabolisable résiduelle, bouvillons hybrides, ration fourrage-céréale, durée du test Residual metabolizable energy intake (RMEI) or the equivalent residual metabolizable feed consumption is recognized as a more precise evaluation of feed efficiency (Arthur et al. 2001;Okine et al. 2003) than feed-to-gain ratio in beef cattle. It is the difference between metabolizable energy intake and metabolizable energy required for maintenance and gain, and is therefore independent of on-test gain and on-test maturing pattern (Fan et al. 1995;Okine et al. 2001). This concept has been used to identify efficient test station bulls, and negative RMEIs (or RFI) indicate that animals either require less energy than what is estimated or are eating less to produce a similar weight gain. A positive RMEI indicates that the animals' energy intake exceeds the predicted requirement (Okine et al. 2001) and such animals are considered less efficient. Since RMEI is moderately heritable (0.35 < h 2 < 0.49), it has been used as a criterion to select breeding stock in tests that have facilities to record individual feed intakes. Testing periods of between 70 and 150 d have been reported in the literature (Archer and Bergh 2000;Liu et al. 2000). A 140-d test is considered an industry standard for testing bulls for rate of gain in North America (Liu Abbreviations: ADG, average daily gain; ALF, alfalfa; DMI, dry matter intake; FEN, fenugreek; LSM, least square mean; RFI, residual feed intake; RMEI, residual metablolizable energy intake 291 and Makarechian 1993;Archer et al. 199...

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Effects of 84-, 112- and 140-day postweaning feedlot performance tests for beef bulls.

Cited by 17 publications

References 13 publications

Meat Production through Evaluation of Stallion Prospects for Simmental and Simbrah Cattle

Meat Production through Evaluation of Stallion Prospects for Simmental and Simbrah Cattle

Effect of duration of performance test on variance component estimates for lamb growth rate

Residual metabolizable energy intake and its association with diet and test duration

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