Energy and protein requirements of woolless sheep under tropical conditions

Barcelos, Sandra de Sousa; Alves, Kaliandra Souza; Mezzomo, Rafael; Luz, Janaina Barros; Cutrim, Darley Oliveira; Gomes, Daiany Íris; Oliveira, Luís Rennan Sampaio; Nascimento, Karolina Batista; Gionbelli, Mateus Pies

doi:10.1016/j.livsci.2019.103856

Cited by 7 publications

(11 citation statements)

References 27 publications

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“…Even after solid-fasting for more than 16 h, the animals still had ingested in their gastrointestinal tracts (GIT). Barcelos et al (2020) suggest a nonlinear relationship between SBW and EBW, with the decreased GIT content proportional to the increased body weight. A nonlinear relationship between SBW and EBW was also found for other ruminant species.…”

Section: Discussionmentioning

confidence: 94%

“…In addition, Barcelos et al (2020) found that the relationship between SBW and EBW was better described by a nonlinear model (AIC = 12.5) than by linear models with (AIC = 13.7) or without (AIC = 26.2) intercepts. They fitted the following final model to estimate the EBW as a function of SBW for growing castrated male hair sheep: EBW = 0.507 (± 0.052) × SBW 1.135(±0.028).…”

Section: Discussionmentioning

confidence: 96%

“…Descriptive statistics were obtained using the described function of the "pandas" package (McKinney, 2010). The relationship between SBW and EBW was assessed according to recommendations by Barcelos et al (2020) we tested three models to estimate EBW as a function of SBW. The following models were tested:…”

Section: Data Analysesmentioning

confidence: 99%

“…The production of meat from sheep is a prominent activity in tropical regions because it has a high potential for generating economic income in agribusiness (Barcelos et al, 2020). Hair sheep are well adapted to the climatic and management conditions of tropical regions (Pereira et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, accurate body measurement of weight is crucial in assessing animal performance and assisting the strategic management of a herd such as formulating diets, weight gain projections and carcass yield (Barcelos et al, 2020;Herbster et al, 2020). Although most of the sheep raised in tropical conditions worldwide are hair breeds, little information is available on their nutritional requirements (Chay-Canul et al, 2011;Chay-Canul et al, 2014;Barcelos et al, 2020). This research aimed at evaluating models for estimation of the EBW in growing hair sheep in a feedlot system under tropical conditions.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Models to Estimate Empty Body Weight in Hair Sheep Raised in a Feedlot System

Salazar-Cuytun

Pool-Yanez²,

Portillo-Salgado

et al. 2022

Trop Subtrop Agroecosyst

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Background. The empty body weight (EBW) represents exactly the animal mass and is used as a base to calculate most of the nutrient requirements in most feeding systems. Objective. To evaluate models for estimating EBW in growing hair sheep in a feedlot system under tropical conditions. Methodology. One hundred fifteen male growing hair sheep lambs (Pelibuey, Black Belly, and Katahdin) between four to ten months of age with a mean shrunk body weight (SBW) of 34.50 ± 7.40 kg (± SD) were used. The relationship between SBW and EBW was assessed by means of three models: Eq. 1. Linear with intercept; Eq. 2.- Linear without intercept and Eq. 3.- Allometric. The predictive ability of models was evaluated by cross-validation. Results. The correlation coefficient among SBW and EBW was high (r = 0.98). The regression equations had high determination coefficients (r2) of 0.97. Based on the evaluations Eq.1 had the performance compared with other models. The following final model was fitted to estimate the EBW as a function of SBW of growing castrated male hair sheep: EBW (kg): -2.39 (± 0.53***) + 0.95(± 0.02***) × SBW (kg). Implications. These results contribute to the development of mathematical models for more accurate weight adjustments in growing hair sheep in a feedlot system under tropical conditions. Conclusion. The equation developed and evaluated in the present study revealed that the linear relationship between SBW and EBW can be used to predict EBW in hair sheep, for that the use of this model can be safely applied to male hair sheep. In addition, it was found that the relation BW/EBW was on average 1.18 for males.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 96%