Comparación de toros Holando, Charbray y Cebú para producción de carne bajo pastoreo rotacional II. Componentes del animal muerto y composición de la canal

Casas, A Eva; Cianzio, Danilo; Rivera, Aixa

doi:10.46429/jaupr.v81i3-4.3635

Cited by 2 publications

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“…Moreover, the DMI equation adopted by the Dairy NRC (2001) [ 9 ] was developed using beef cattle data [ 10 ], which explains its low adequacy for dairy heifers. Dairy cattle breeds have a higher proportion of internal organs (liver, intestine, and kidney) than beef cattle [ 90 , 91 ], which is related to higher NE m requirements. On the other hand, heifers present lower NE m requirements compared with bulls (~15%) [ 92 ].…”

Section: Discussionmentioning

confidence: 99%

Feed Intake of Growing Dairy Heifers Raised under Tropical Conditions: A Model Evaluation Using Meta-Analysis

Busanello

Sousa

Mendonça

et al. 2021

Animals

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Several models for predicting dry matter intake (DMI) of replacement dairy heifers have been developed; however, only a few have been evaluated using data from heifers of different breeds raised under tropical conditions. Thus, the objective of this study was to evaluate the DMI equations for dairy heifers managed under tropical conditions. A total of 230 treatment means from 61 studies using dairy heifers (n = 1513 heifers, average body weight = 246 kg) were used. The animals were grouped into two groups based on their genetics: (1) Bos taurus (Holstein, Jersey, Brown Swiss, and Holstein × Jersey) and (2) crossbred (Bos taurus × Bos indicus). Seven previously published DMI equations (HH, HHJ, QUI, STA, 2001 NRC, OFLin, and OFNLin) for heifers were evaluated using mean bias, slope bias, mean squared prediction errors (MSPE) and its decomposition, and other model evaluation statistics. For Bos taurus heifers, our results indicated that OFNLin and HHJ had lower mean bias (0.13 and 0.16 kg/d, respectively) than other models. There was no significant slope or mean bias for HHJ and OFNLin (p > 0.05), indicating agreement between the observed and predicted DMI values. All other models had a significant mean bias (p < 0.05), whereas the QUI model also presented a significant slope bias (p < 0.02). For crossbred heifers, the STA equation was the only one that did not present mean and slope bias significance (p > 0.05). All other DMI models had significant mean bias when evaluated using crossbred data (p < 0.04), and QUI, OFLin, and OFNLin also presented significant slope bias (p < 0.01). Based on our results, predictions from OFNLin and HHJ best represented the observed DMI of Bos taurus heifers (MSPE ≤ 1.25 kg2/d2, mean bias ≤ 0.16 kg/d), whereas STA was the best model for crossbred heifers (MSPE = 1.25 kg2/d2, mean bias = 0.09 kg/d). These findings indicate that not all available models are adequate for estimating the DMI of dairy heifers managed under a tropical climate, with HHJ and OFNLin for Bos taurus and STA for crossbreds being the most suitable models for DMI prediction. There is evidence that models from Bos taurus heifers could be used to estimate the DMI of heifers under tropical conditions. For heifer ration formulation is necessary to consider that DMI is influenced by breed, diet, management, and climate. Future work should also include animal genetic and environmental variables for the prediction of DMI in dairy heifers.

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Section: Discussionmentioning

confidence: 99%

Feed Intake of Growing Dairy Heifers Raised under Tropical Conditions: A Model Evaluation Using Meta-Analysis

Busanello

Sousa

Mendonça

et al. 2021

Animals

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show abstract

“…Especialmente, os modelos do NRC Beef Cattle (NRC, 1984;1996;2000; indicam que a EL m pode ser estimada a partir do peso vivo metabólico em jejum (PV J 0,75 vísceras que são os principais órgãos consumidores de energia corporal Casas et al, 1997). Visto que são poucos os estudos atuais com novilhas leiteiras em crescimento, especialmente com raças diferentes da Holandesa e cruzamentos raciais, e que estes existentes indicam que a EL m aumentou para a raça Holandesa, novas pesquisas são necessárias para entender as necessidades nutricionais dessa categoria animal.…”

Section: Exigências Nutricionais De Novilhas Leiteirasunclassified

Curvas de crescimento e consumo de alimentos em novilhas leiteiras de reposição

Busanello¹

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Comparación de toros Holando, Charbray y Cebú para producción de carne bajo pastoreo rotacional II. Componentes del animal muerto y composición de la canal

Cited by 2 publications

References 5 publications

Feed Intake of Growing Dairy Heifers Raised under Tropical Conditions: A Model Evaluation Using Meta-Analysis

Feed Intake of Growing Dairy Heifers Raised under Tropical Conditions: A Model Evaluation Using Meta-Analysis

Curvas de crescimento e consumo de alimentos em novilhas leiteiras de reposição

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