Effects of repeated cycles of feed intake shifts on growth, feed efficiency and endocrine profiles of wether lambs. Estell, R. E., Havstad, K., Heird, C., Fredrickson, E. L., Hallford, D., & Shupe, W. L. Small Ruminant Research, 1993.
Paper abstract bibtex Fifteen wether lambs (average BW 28.8 ± 1.8 kg) were used in a 128-d trial to examine effects of cyclical feeding changes on growth, feed efficiency and endocrine profiles. Control lambs were fed a 40% concentrate diet (40C) at 1.5 × NE$_{\textrm{m}}$ requirement during period 1 (64 d). Another group (1x/2x) was fed 40C at 1 and 2 x NE$_{\textrm{m}}$ in 4-d intervals during period 1; a third group (70/10) 70% and 10% concentrate diets in 4-d intervals during period 1. To achieve dry matter intake comparable to controls, 70/10 lambs were fed at 1.79 (70C) and 1.21 (10C) × NE$_{\textrm{m}}$. All lambs were placed on the control diet during period 2 (32 d) and increased to 2 x maintenance during period 3 (32 d). During period 2, ADG and gain/feed of control lambs tended to be greater (P\textless0.10) than for lambs fed alternating treatments. Liver weight as a percentage of hot carcass weight was greater (P\textless0.05) for controls than for lambs fed alternating treatments. Hot carcass weight (P=0.07) and dressing percentage (P=0.09) tended to be greater for the 70/10 treatment than for controls. The 1x/2x treatment lowered (P\textless0.05) serum cholesterol compared with other groups on d 65, but not on d 0 or 129. Smaller liver weight per unit of hot carcass weight for lambs in the 1x/2x and 70/10 treatments suggests a possible reduction of maintenance requirements.
@article{estell_effects_1993,
title = {Effects of repeated cycles of feed intake shifts on growth, feed efficiency and endocrine profiles of wether lambs},
volume = {10},
url = {bibliography/398.pdf},
abstract = {Fifteen wether lambs (average BW 28.8 ± 1.8 kg) were used in a 128-d trial to examine effects of cyclical feeding changes on growth, feed efficiency and endocrine profiles. Control lambs were fed a 40\% concentrate diet (40C) at 1.5 × NE$_{\textrm{m}}$ requirement during period 1 (64 d). Another group (1\textit{x}/2\textit{x}) was fed 40C at 1 and 2 x NE$_{\textrm{m}}$ in 4-d intervals during period 1; a third group (70/10) 70\% and 10\% concentrate diets in 4-d intervals during period 1. To achieve dry matter intake comparable to controls, 70/10 lambs were fed at 1.79 (70C) and 1.21 (10C) × NE$_{\textrm{m}}$. All lambs were placed on the control diet during period 2 (32 d) and increased to 2 x maintenance during period 3 (32 d). During period 2, ADG and gain/feed of control lambs tended to be greater (\textit{P}{\textless}0.10) than for lambs fed alternating treatments. Liver weight as a percentage of hot carcass weight was greater (\textit{P}{\textless}0.05) for controls than for lambs fed alternating treatments. Hot carcass weight (\textit{P}=0.07) and dressing percentage (\textit{P}=0.09) tended to be greater for the 70/10 treatment than for controls. The 1\textit{x}/2\textit{x} treatment lowered (\textit{P}{\textless}0.05) serum cholesterol compared with other groups on d 65, but not on d 0 or 129. Smaller liver weight per unit of hot carcass weight for lambs in the 1\textit{x}/2\textit{x} and 70/10 treatments suggests a possible reduction of maintenance requirements.},
journal = {Small Ruminant Research},
author = {Estell, R. E. and Havstad, KM and Heird, C.E. and Fredrickson, E. L. and Hallford, D.M. and Shupe, W. L.},
year = {1993},
keywords = {JRN}
}
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Control lambs were fed a 40% concentrate diet (40C) at 1.5 × NE$_{\\textrm{m}}$ requirement during period 1 (64 d). Another group (1<i>x</i>/2<i>x</i>) was fed 40C at 1 and 2 x NE$_{\\textrm{m}}$ in 4-d intervals during period 1; a third group (70/10) 70% and 10% concentrate diets in 4-d intervals during period 1. To achieve dry matter intake comparable to controls, 70/10 lambs were fed at 1.79 (70C) and 1.21 (10C) × NE$_{\\textrm{m}}$. All lambs were placed on the control diet during period 2 (32 d) and increased to 2 x maintenance during period 3 (32 d). During period 2, ADG and gain/feed of control lambs tended to be greater (<i>P</i>\\textless0.10) than for lambs fed alternating treatments. Liver weight as a percentage of hot carcass weight was greater (<i>P</i>\\textless0.05) for controls than for lambs fed alternating treatments. Hot carcass weight (<i>P</i>=0.07) and dressing percentage (<i>P</i>=0.09) tended to be greater for the 70/10 treatment than for controls. 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