Effects of Flourensia cernua ingestion on nitrogen balance of sheep consuming tobosa

Effects of Flourensia cernua ingestion on nitrogen balance of sheep consuming tobosa. King, D., Fredrickson, E. L., Estell, R. E., Havstad, K., Wallace, J. D., & Murray, L. Journal of Range Management, 1996.

Paper abstract bibtex

Flourensia cernua DC. (tarbush) is a deciduous shrub with potential as a high-protein forage source for livestock. Twenty-four Polypay x Rambouillet wethers housed in metabolism crates were used to evaluate tarbush as a N source for sheep fed a low quality grass diet. Treatments were 100% ground tobosa grass (Pleuraphis mutica Buckl.) or tobosa substituted with 10, 20, or 30% whole pre-bloom tarbush leaves (n = 5) or 26% ground alfalfa (n = 4, Medicago sativa L.) on a dry matter basis (dmb). Sheep were fed ad libitum for 11 days, after which feed was restricted to 1 % (dmb) of body weight for 11 days to reduce sorting and maintain uniform intake. Apparent dry matter digestibility was not improved (P = 0.2646) with tarbush or alfalfa. Fecal N was similar (P = 0.1626), but urinary N varied (P = 0.0008) among treatments. Apparent N digestibility differed (P = 0.0042) among treatments (43, 46, 50, 56, and 63% for sheep consuming 0, 10, 20, or 30% tarbush or alfalfa, respectively). All treatments resulted in similar (P = 0.1569) but negative N retentions (-2.4, -2.2, -2.8, -2.0, and -1.5 g day$^{\textrm{-1}}$ for sheep consuming 0, 10, 20, or 30% tarbush or alfalfa, respectively). Serum clinical profiles (day 22) confirmed all sheep were nutritionally stressed, but did not indicate toxicosis. Although neither tarbush nor alfalfa N compensated for the low quality basal diet, N from 30% tarbush was utilized with similar efficiency to alfalfa N. The major impediment for using tarbush as a N source appeared to be low palatability.

@article{king_effects_1996,
	title = {Effects of {Flourensia} cernua ingestion on nitrogen balance of sheep consuming tobosa},
	volume = {49},
	url = {bibliography/497.pdf},
	abstract = {\textit{Flourensia cernua }DC. (tarbush) is a deciduous shrub with potential as a high-protein forage source for livestock. Twenty-four Polypay x Rambouillet wethers housed in metabolism crates were used to evaluate tarbush as a N source for sheep fed a low quality grass diet. Treatments were 100\% ground tobosa grass \textit{(Pleuraphis mutica }Buckl.) or tobosa substituted with 10, 20, or 30\% whole pre-bloom tarbush leaves \textit{(n }= 5) or 26\% ground alfalfa \textit{(n }= 4, \textit{Medicago sativa }L.) on a dry matter basis (dmb). Sheep were fed \textit{ad libitum }for 11 days, after which feed was restricted to 1 \% (dmb) of body weight for 11 days to reduce sorting and maintain uniform intake. Apparent dry matter digestibility was not improved \textit{(P }= 0.2646) with tarbush or alfalfa. Fecal N was similar \textit{(P = }0.1626), but urinary N varied \textit{(P = }0.0008) among treatments. Apparent N digestibility differed \textit{(P = }0.0042) among treatments (43, 46, 50, 56, and 63\% for sheep consuming 0, 10, 20, or 30\% tarbush or alfalfa, respectively). All treatments resulted in similar \textit{(P = }0.1569) but negative N retentions (-2.4, -2.2, -2.8, -2.0, and -1.5 g day$^{\textrm{-1}}$ for sheep consuming 0, 10, 20, or 30\% tarbush or alfalfa, respectively). Serum clinical profiles (day 22) confirmed all sheep were nutritionally stressed, but did not indicate toxicosis. Although neither tarbush nor alfalfa N compensated for the low quality basal diet, N from 30\% tarbush was utilized with similar efficiency to alfalfa N. The major impediment for using tarbush as a N source appeared to be low palatability.},
	journal = {Journal of Range Management},
	author = {King, D. and Fredrickson, E. L. and Estell, R. E. and Havstad, KM and Wallace, J. D. and Murray, L.},
	year = {1996},
	keywords = {JRN}
}

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Twenty-four Polypay x Rambouillet wethers housed in metabolism crates were used to evaluate tarbush as a N source for sheep fed a low quality grass diet. Treatments were 100\\% ground tobosa grass \\textit{(Pleuraphis mutica }Buckl.) or tobosa substituted with 10, 20, or 30\\% whole pre-bloom tarbush leaves \\textit{(n }= 5) or 26\\% ground alfalfa \\textit{(n }= 4, \\textit{Medicago sativa }L.) on a dry matter basis (dmb). Sheep were fed \\textit{ad libitum }for 11 days, after which feed was restricted to 1 \\% (dmb) of body weight for 11 days to reduce sorting and maintain uniform intake. Apparent dry matter digestibility was not improved \\textit{(P }= 0.2646) with tarbush or alfalfa. Fecal N was similar \\textit{(P = }0.1626), but urinary N varied \\textit{(P = }0.0008) among treatments. Apparent N digestibility differed \\textit{(P = }0.0042) among treatments (43, 46, 50, 56, and 63\\% for sheep consuming 0, 10, 20, or 30\\% tarbush or alfalfa, respectively). 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