A simulation model to predict body weight gain in lambs fed high-grain diets

Osorio, Alexander; Mendoza, G.D.; Plata, Fernando; Martínez, J. Alfredo; Vargas, Luis Mario Tapia; Ortega, Gonzálvez

doi:10.1016/j.smallrumres.2014.12.004

Cited by 5 publications

(2 citation statements)

References 21 publications

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“…Thus, in the current study, the higher plasma IGI-1 level in the HG group might be explained by the high-energy intake in sheep fed an HG diet. Consistent with some previous reports that found HG diet feeding increased the final body weight of sheep [ 43 , 44 ], the current study also revealed that the BW at slaughter increased linearly with the days fed an HG diet.…”

Section: Discussionsupporting

confidence: 92%

Morphological adaptation of sheep’s rumen epithelium to high-grain diet entails alteration in the expression of genes involved in cell cycle regulation, cell proliferation and apoptosis

Wang

Liu

et al. 2018

J Animal Sci Biotechnol

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BackgroundThe objectives of this study were to characterize changes in the relative mRNA expression of candidate genes and proteins involved in cell cycle regulation, cell proliferation and apoptosis in the ruminal epithelium (RE) of sheep during high-grain (HG) diet adaptation.ResultsTwenty sheep were assigned to four groups with five animals each. These animals were assigned to different periods of HG diet (containing 40% forage and 60% concentrate mix) feeding. The HG groups received an HG diet for 7 (G7, n = 5), 14 (G14, n = 5) and 28 d (G28, n = 5), respectively. In contrast, the control group (CON, n = 5) was fed the forage-based diet for 28 d. The results showed that HG feeding linearly decreased (P < 0.001) the ruminal pH, and increased the concentrations of ruminal total volatile fatty acid (linear, P = 0.001), butyrate (linear, P < 0.001), valerate (quadratic P = 0.029) and the level of IGF-1 (quadratic, P = 0.043) in plasma. The length (quadratic, P = 0.004), width (cubic, P = 0.015) and surface of the ruminal papillae (linear, P = 0.003) were all enlarged after 14 d of HG diet feeding. HG feeding cubically increased the number of cell layers forming the stratum corneum (SC, P < 0.001) and the thickness of the SC (P < 0.001) and stratum basale (P < 0.001). The proportion of basal layer cells in the RE decreased (linear, P < 0.001) in the G0/G1-phase, but it increased linearly (P = 0.006) in the S-phase and cubically (P = 0.004) in the G2/M-phases. The proportion of apoptosis cells in G7, G14 and G28 was reduced compared to the CON (quadratic, P < 0.001). HG diet feeding linearly decreased the mRNA expression of Cyclin E1 (P = 0.021) and CDK-2 (P = 0.001) and (P = 0.027) the protein expression of Cyclin E1. Feeding an HG diet linearly increased the mRNA expression of genes IGFBP-2 (P = 0.034) and IGFBP 5 (P < 0.009), while linearly decreasing (P < 0.001) the IGFBP 3 expression. The expression of cell apoptosis gene Caspase 8 decreased (quadratic, P = 0.012), while Bad mRNA expression tended to decrease (cubic, P = 0.053) after HG feeding.ConclusionsThese results demonstrated sequential changes in rumen papillae size, cell cycle regulation and the genes involved in proliferation and apoptosis as time elapsed in feeding a high-grain diet to sheep.Electronic supplementary materialThe online version of this article (10.1186/s40104-018-0247-z) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 92%

Morphological adaptation of sheep’s rumen epithelium to high-grain diet entails alteration in the expression of genes involved in cell cycle regulation, cell proliferation and apoptosis

Wang

Liu

et al. 2018

J Animal Sci Biotechnol

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“…In addition, ANNs were superior to other models. Osorio et al [ 25 ] predicted average daily gains in lambs based on the digestibility and composition of the diet using a regression model and obtained acceptable accuracy and precision. Finally, Aranda et al [ 26 ] utilized a deterministic model for predicting daily weight gains in growing steers grazing tropical pastures.…”

Section: Introductionmentioning

confidence: 99%

Classification of Daily Body Weight Gains in Beef Calves Using Decision Trees, Artificial Neural Networks, and Logistic Regression

Grzesiak

Zaborski

Pilarczyk

et al. 2023

Animals

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The aim of the present study was to compare the predictive performance of decision trees, artificial neural networks, and logistic regression used for the classification of daily body weight gains in beef calves. A total of 680 pure-breed Simmental and 373 Limousin cows from the largest farm in the West Pomeranian Province, whose calves were fattened between 2014 and 2016, were included in the study. Pre-weaning daily body weight gains were divided into two categories: A—equal to or lower than the weighted mean for each breed and sex and B—higher than the mean. Models were developed separately for each breed. Sensitivity, specificity, accuracy, and area under the curve on a test set for the best model (random forest) were 0.83, 0.67, 0.76, and 0.82 and 0.68, 0.86, 0.78, and 0.81 for the Limousin and Simmental breeds, respectively. The most important predictors were daily weight gains of the dam when she was a calf, daily weight gains of the first calf, sex of the third calf, milk yield at first lactation, birth weight of the third calf, dam birth weight, dam hip height, and second calving season. The selected machine learning models can be used quite effectively for the classification of calves based on their daily weight gains.

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A Mechanistic dynamic simulation model of nutrient utilization, growth and body composition in pre-weaned lambs reared artificially

Anim-Jnr

Morel

Kenyon

et al. 2020

Animal Feed Science and Technology

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A simulation model to predict body weight gain in lambs fed high-grain diets

Cited by 5 publications

References 21 publications

Morphological adaptation of sheep’s rumen epithelium to high-grain diet entails alteration in the expression of genes involved in cell cycle regulation, cell proliferation and apoptosis

Morphological adaptation of sheep’s rumen epithelium to high-grain diet entails alteration in the expression of genes involved in cell cycle regulation, cell proliferation and apoptosis

Classification of Daily Body Weight Gains in Beef Calves Using Decision Trees, Artificial Neural Networks, and Logistic Regression

A Mechanistic dynamic simulation model of nutrient utilization, growth and body composition in pre-weaned lambs reared artificially

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