Maintenance and Growth Requirements in Male Dorper × Santa Ines Lambs

Mendes, Marcilio S.; Souza, José Gomes de; Herbster, Caio Júlio Lima; Neto, Antonio S. Brito; Silva, Luciano; Rodrigues, João Paulo Pacheco; Marcondes, Marcos Inácio; Oliveira, Ronaldo Lopes; Bezerra, Leílson Rocha; Pereira, Elzânia Sales

doi:10.3389/fvets.2021.676956

Cited by 8 publications

(5 citation statements)

References 31 publications

(58 reference statements)

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“…Duarte-Vera et al (2012) used EBW data from studies of Pelibuey sheep and reported that the EBW was 81.4% of the SBW, and stated that GIT fill was 18%, which is greater than that for wool sheep. Mendes et al (2021) found a linear relationship between SBW and EBW (EBW (kg) = 0.547 (± 0.564) + 0.827 (± 0.016) × SBW) in crossbreed Dorper × Santa Ines lambs, resulting in a GIT fill of 17%.…”

Section: Discussionmentioning

confidence: 98%

“…The nutritional guidelines for small ruminants, such as the Small Ruminant Nutrition System (SRNS) (Cannas et al, 2004;Tedeschi et al, 2010;Mendes et al, 2021) are continuously being updated with data that were unavailable for some of the parameters required by these models in order to predict the performance of hair sheep breeds, including mature weight, body weight adjustments, maturity index for determination of standards in nutritional requirements (Chay-Canul et al, 2014). However, in tropical conditions, the nutritional requirements recommended by international committees may not be adequate to meet the physiological needs at different stages of the animal's life.…”

Section: Discussionmentioning

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: 98%

Section: Discussionmentioning

confidence: 99%

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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“…They concluded that net energy and protein requirements for maintenance of Morada Nova lambs slaughtered between 15 and 28 kg did not vary by sex, and NEg increases and NPg decreased with the increase in body weight in hair lambs. Mendes et al [54] utilized 35 crossbreed Doper x Santa Ines lambs in a slaughter experiment to estimate energy and protein requirements for maintenance and growth and concluded that NEm for crossbreed Dorper × Santa Ines lambs was similar to those recommended by the international committees but NEg was lower.…”

Section: Energy and Protein Requirements In Sheepmentioning

confidence: 99%

Nutrient Utilization, Requirements and Nutrigenomics in Sheep and Goats

2024

Preprint

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The most recent National Research Council Nutrient Requirements for Sheep and Goats was published in 2007, one of the most consequential nutrient requirement recommendations for sheep and goats in the world. It is pertinent to continue the refinement and discussion of nutrient utilization and requirements for the purposes of enhancing the efficiency of production systems, maximizing resource economy, and minimizing the carbon footprint, among others. Progress has been made in the estimation of energy and protein requirements in sheep and goats, mainly utilizing empirical feeding experimentation, comparative slaughter technique and minimum endogenous loss method. In sheep, newer estimates of energy and protein requirements for maintenance and growth and partial efficiencies had been reported since 2007. There were suggestions that energy and protein requirements could have been affected by breed, wool growth, gender and size; with these reported values being similar or lower than the recommended values in international feeding systems such as NRC, ARC, INRA and AFRC. In goats, energy and protein requirements for growing goats were reported to be either higher or lower than the established recommendations, depending upon meat or dairy breeds. Effect of gender on energy requirement appeared to be related to the stage of growth or degree of maturity. Newer data also suggested that the guidelines of the major feeding systems for the entire growth phase may not be adequate for non-pregnant and non-lactating pubertal females. In multiparous pregnant goats, energy and protein requirements for maintenance did not appear to be affected by days of pregnancy, but efficiencies of metabolizable energy and metabolizable protein utilization for pregnancy were. There were suggestions that that metabolizable protein synthesis in the rumen can be predicted from energy intake using combined equations that encompass both sheep and goats, but more data on goats were called for to account for specific differences in nutrition. In addition to sulfur, there has been progress made on the estimation of maintenance and growth requirements of calcium, phosphorus, potassium and magnesium in goats, with suggestions on the consideration of gender and breed differences. Species, level of Intake, genotype, mature size, age, gender, body composition, use of tissue energy, activity, season, and acclimatization continue to be important considerations for the estimation of nutrient requirements in sheep and goats, with emerging factors such as climate change, heat stress, parasitism and secondary plant compounds. Model equations and partial efficiencies used by NRC to predict energy and protein requirements for maintenance, growth, lactation, and fiber have been highlighted and discussed for the purpose of a more focus discussion and refinement for the future. Potential and limitation of both traditional and emerging methodologies in determining the nutrient requirements in sheep and goats were discussed. To justify the research investment, emerging methodologies such as nutrigenomics will have to be linked more directly to the improvement of production efficiency via more precise prediction of nutrient requirement.

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“…Studies with hair sheep have generated a considerable amount of data, contributing to our understanding of nutritional patterns (Mendes et al ., 2021). The hair lambs' body weight (BW) may vary throughout the year according to various factors such as feed quality and availability, mainly in grazing systems and warm areas.…”

Section: Introductionmentioning

confidence: 99%

Determination of the mature weight of intact male hair sheep

et al. 2021

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The objective of this study is to provide approaches to determine the mature weight of intact male hair sheep using body composition data. To estimate empty body weight (EBW) at maturity, we used information from eight independent studies comprising a total of 250 intact males in growing and finishing phases. The quantitative data used for each animal were body weight (BW), EBW, water-free EBW protein content, water-free EBW fat content, water-free EBW ash content and EBW water content. The water, protein, fat and ash contents in the EBW and water-free EBW were predicted by non-linear regressions. The best model was chosen considering the achievement of convergence and capacity for biological explanation. The standard deviation of the asymptotic EBW was computed using a simulation method based on a Monte Carlo approach. Among the non-linear evaluations, only the allometric function converged with the parameters within the expected biological limits. To estimate mature EBW, only protein and fat were suitable to predict estimates with the capacity to biological explanation. The water and protein contents in the EBW were closely associated. Animal maturity can be estimated mathematically using body composition. Maturity was reached at an EBW of 47.3 and 57.5 kg when protein and fat were used as a predictor, respectively. We conclude that protein is a good predictor of maturity for intact male hair sheep.

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Maintenance and Growth Requirements in Male Dorper × Santa Ines Lambs

Cited by 8 publications

References 31 publications

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

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

Nutrient Utilization, Requirements and Nutrigenomics in Sheep and Goats

Determination of the mature weight of intact male hair sheep

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