Energy intake, heat production and energy and nitrogen balances of sheep and goats fed wheat straw as a sole diet

El-Meccawi, Shaher; Kam, Michael; Brosh, A.; Degen, A. Allan

doi:10.1016/j.livsci.2009.02.018

Cited by 20 publications

(8 citation statements)

References 21 publications

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“…The intake in the present study is comparable with that of 42 g per kg BW 0.75 previously recorded in goats fed sorghum straw treated with 2% urea solution or wheat straw as a sole diet (Nianogo et al, 1999;El-Meccawi et al, 2009). When expressed as the percentage of body weight, the average daily DMI for goats in the present study is within the Least-squares means with a common superscript in the same row are not significantly different (P N 0.05).…”

Section: Feed Intake and Growth Performancesupporting

confidence: 91%

Growth, carcass and meat quality characteristics of Small East African goats fed straw based diets

et al. 2011

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Section: Feed Intake and Growth Performancesupporting

confidence: 91%

Growth, carcass and meat quality characteristics of Small East African goats fed straw based diets

et al. 2011

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“…The total daily DMI was calculated as the sum of all meals consumed within each day corrected for DM content. The average daily metabolizable energy intake (MEI) per unit of metabolic body weight was estimated using the following equation: MEI ϭ [gross energy ϫ digestible energy (42) ϫ 0.82]/metabolic body weight as previously described (16). Animals were weighed at 14-day intervals over both dietary periods using calibrated scales.…”

Section: Methodsmentioning

confidence: 99%

Effect of Phenotypic Residual Feed Intake and Dietary Forage Content on the Rumen Microbial Community of Beef Cattle

Carberry

Kenny

Han

et al. 2012

Appl Environ Microbiol

262

224

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ABSTRACTFeed-efficient animals have lower production costs and reduced environmental impact. Given that rumen microbial fermentation plays a pivotal role in host nutrition, the premise that rumen microbiota may contribute to host feed efficiency is gaining momentum. Since diet is a major factor in determining rumen community structure and fermentation patterns, we investigated the effect of divergence in phenotypic residual feed intake (RFI) on ruminal community structure of beef cattle across two contrasting diets. PCR-denaturing gradient gel electrophoresis (DGGE) and quantitative PCR (qPCR) were performed to profile the rumen bacterial population and to quantify the ruminal populations ofEntodiniumspp., protozoa,Fibrobacter succinogenes,Ruminococcus flavefaciens,Ruminococcus albus,Prevotella brevis, the genusPrevotella, and fungi in 14 low (efficient)- and 14 high (inefficient)-RFI animals offered a low-energy, high-forage diet, followed by a high-energy, low-forage diet. Canonical correspondence and Spearman correlation analyses were used to investigate associations between physiological variables and rumen microbial structure and specific microbial populations, respectively. The effect of RFI on bacterial profiles was influenced by diet, with the association between RFI group and PCR-DGGE profiles stronger for the higher forage diet. qPCR showed thatPrevotellaabundance was higher (P< 0.0001) in inefficient animals. A higher (P< 0.0001) abundance ofEntodiniumandPrevotellaspp. and a lower (P< 0.0001) abundance ofFibrobacter succinogeneswere observed when animals were offered the low-forage diet. Thus, differences in the ruminal microflora may contribute to host feed efficiency, although this effect may also be modulated by the diet offered.

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“…Midtest metabolic body weight (MBW) was estimated from the intercept and slope of the regression line after fitting a linear regression through all metabolic body weight (BW 0.75 ) observations. Average daily metabolizable energy intake (MEI) per unit of metabolic body weight was estimated using the following equation MEI ϭ [gross energy ϫ digestible energy (66a) ϫ 0.82]/MBW as previously described (30). Feed conversion ratio (FCR) of each animal was computed as the ratio of daily DMI to ADG.…”

Section: Animal Modelmentioning

confidence: 99%

mRNA expression of genes regulating oxidative phosphorylation in the muscle of beef cattle divergently ranked on residual feed intake

Kelly

Waters

McGee

et al. 2011

Physiological Genomics

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Our objective was to evaluate the effects of phenotypic ranking on residual feed intake (RFI) on the transcription of genes 1) involved in the respiratory chain complex and 2) coding for transcriptional factors regulating mitochondrial biogenesis, across two contrasting diet types. Beef heifers (n = 86) fed a diet comprising 70:30 concentrate-corn silage [low forage (LF)] over a 82-day period were ranked on RFI. The 10 highest (feed inefficient, high-RFI) and 10 lowest (feed efficient, low-RFI) ranking animals were selected for the current study. Biopsies of the M. longissimus dorsi were harvested following initial selection (LF diet) and again following a 6 wk period while the animals were offered a high-forage (HF) grass silage-only diet. Real-time PCR was used to quantify mRNA transcripts of 17 genes associated with cellular energetic efficiency. The mRNA expression of UCP3 tended to be upregulated (2.2-fold, P = 0.06) for the high-RFI compared with the low-RFI animals. mRNA transcripts coding for the transcription factor PGC-1α was 1.7-fold higher (P = 0.01) in low compared with high-RFI animals. A phenotype × diet interaction was evident for the abundance of ANT1 mRNA transcript, with greater (P = 0.04) expression levels detected in the low-RFI phenotype during the HF period, but no difference (P = 0.50) between phenotypes during the LF period. A phenotype × diet interaction was also evident for COX II with greater expression levels detected (P = 0.04) in the low compared with the high RFI phenotype while on LF but not the HF diet (P = 0.22). These data suggest an association between cellular energetic efficiency and RFI in cattle.

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Energy intake, heat production and energy and nitrogen balances of sheep and goats fed wheat straw as a sole diet

Cited by 20 publications

References 21 publications

Growth, carcass and meat quality characteristics of Small East African goats fed straw based diets

Growth, carcass and meat quality characteristics of Small East African goats fed straw based diets

Effect of Phenotypic Residual Feed Intake and Dietary Forage Content on the Rumen Microbial Community of Beef Cattle

mRNA expression of genes regulating oxidative phosphorylation in the muscle of beef cattle divergently ranked on residual feed intake

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