Intravenous infusion of cysteine and wool growth of romney sheep

Dryden, G. McL.; Wickham, G. A.; Cockrem, F. R. M.

doi:10.1080/00288233.1969.10421242

Cited by 10 publications

(8 citation statements)

References 9 publications

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“…The lack of any response in digestibility to methionine supplementation contrasts with the findings of Dryden et al (1969), Polan et al (1970), andBarry (1971) . The chemical composition of the basal diet may be important in determining if any response in digestibility to supplementation with SAA's is obtained.…”

Section: Effect Of Methionine Supplementation On the Digestibility Ofcontrasting

confidence: 54%

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Effect of formaldehyde treatment on the chemical composition and nutritive value of silage

Barry

Fennessy

1973

New Zealand Journal of Agricultural Research

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Untreated and formaldehyde (HCHO) -treated silages were fed to sheep over a 6-week period. Each silage was fed at two levels of energy intake; maintenance, when digestibility v.,as measured, and ad libitum. Supplements of D-L methionine were given by oral and intraperitoneal methods. The chemical composition and osmotic pressure of rumen fluid were determined on all treatments.Formaldehyde treatment reduced the apparent digestibility of nitrogen (N) by 10% (P < 0.01). The trend for this treatment to reduce the digestibility of dry matter and energy by 3-4% did not attain significance. Oral or intraperitoneal supplementation with D-L methionine did not affect the digestibility of dry matter, energy, or N. After feeding there was an increase in the concentration of ammonia and volatile fatty acids in rumen fluid and in the osmotic pressure of this medium. In post-feeding samples of rumen fluid, the concentration of ammonia and the molar proportions of iso-and n-valeric acids were reduced by HCHO treatment of silage, from which it was deduced that protein breakdown during the combined silage plus rumen fermentation processes was reduced by this treatment. Methionine supplementation had no effect on any of the rumen fluid parameters measured. 59

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Section: Effect Of Methionine Supplementation On the Digestibility Ofcontrasting

confidence: 54%

“…Oral supplementation with methionine hydroxy analogue (Polan et al 1970), intravenous infusion of cysteine (Dryden et al 1969), and intraperitoneal injection of methionine (Barry 1971) have all in· creased the digestibility of forage-based diets fed to ruminants. However, different forages were used il'.…”

Section: Introductionmentioning

confidence: 99%

Effect of formaldehyde treatment on the chemical composition and nutritive value of silage

Barry

Fennessy

1973

New Zealand Journal of Agricultural Research

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“…Wool growth has a high requirement for cystine, and post-ruminal supplementation with sulphurcontaining amino acids (SAA's) in sheep fed forage diets at maintenance has given marked responses in wool growth, both with Merino sheep in Australia (summarized by McDonald, 1968) and with Romney sheep in New Zealand (Dryden, Wickham & Cockrem, 1969;Barry, 19736). To investigate the relationship between wool growth response to formaldehyde treatment and the content of protein-bound SAA's in the diet dry matter, the data collected from Invermay Research Centre with forage diets has been plotted in Fig.…”

Section: Wool Growthmentioning

confidence: 98%

Evaluation of formaldehyde-treated lucerne hay for protecting protein from ruminal degradation, and for increasing nitrogen retention, wool growth, live-weight gain and voluntary intake when fed to young sheep

Barry

1976

J. Agric. Sci.

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StnVtMARYIn three separate experiments, lucerne hay was sprayed with solutions of formaldehyde as it was being baled. Moisture content at baling was respectively 20, 28 and 34 % in Expts 1, 2 and 3, the latter being considered higher than normal. Dry matter lost during 4 months of storage averaged 6-7 % and was unaffected by formaldehyde treatment.Increasing rates of formaldehyde application decreased the amount of plant nitrogen digested in the microbial stage of an in vitro system and increased the amount of nitrogen digested in the subsequent acid-pepsin stage (Expt 1 only). When the hays were fed at constant intake to sheep in metabolism cages, formaldehyde treatment depressed the concentration of ammonia and volatile fatty acids (VFA's) in rumen fluid and lowered the molar proportions of iso-and n-valeric acids, but caused either very little or no depression in apparent energy digestibility. It was concluded that formaldehyde treatment of the hays reduced protein degradation by rumen microorganisms and probably increased the amount of protein digested in the post-ruminal region of the digestive system, and that this was achieved without any serious effect on energy digestion.The hays were also fed for 50 days at restricted and ad libitum intakes to young Komney sheep kept in outdoor pens, followed by a 55-day post-treatment period on spring pasture. Voluntary intake was high in both experiments and was unaffected by formaldehyde treatment in hay baled at normal moisture content. There was a tendency for formaldehyde treatment to cause a small increase in voluntary intake in hay baled at the highest moisture content, but this was counteracted by its effect in depressing digestibility, giving no increase in digestible dry-matter intake. Live-weight gains were low in relation to intake, giving a weight loss in most treatment groups. Formaldehyde treatment significantly reduced weight loss and the effect was still present at the end of the post-treatment period. From regressions of weight change on digestible energy intake, it was considered that formaldehyde treatment had brought about a small improvement in the efficiency with which energy was used below maintenance.Wool growth rates appeared normal for the levels of intake achieved and were increased 14-5 % by formaldehyde treatment at ad libitum intake and 5-5 % at restricted intake. Residual responses to formaldehyde treatment in the post-treatment period averaged 8 %. The total amount of extra clean wool produced from formaldehyde treatment over bothperiodswas46and94g respectively at the restricted and ad libitum intakes, representing only 1-5 and 3-0% of the annual fleece production. Wool growth on diets treated with formaldehyde in sheep feed at the maintenance level of energy intake is discussed in relation to the concentration of protein-bound sulphur-containing amino acids (SAA's) in the diet dry matter. It was concluded that large responses in wool growth from protein protection of forage diets are unlikely unless the concentration of SAA's in the dr...

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“…Nine of these had previously shown a wool growth response to intravenous cysteine infusion (Dryden et al 1969). The animals were randomly divided into four groups of three sheep.…”

Section: Animalsmentioning

confidence: 99%

Wool growth and plasma amino acid responses of N.Z. romney sheep to formalin-treated casein and methionine supplements

Carrico

Cockrem

Haden³

et al. 1970

New Zealand Journal of Agricultural Research

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ABSTRACfLactic casein was treated with formalin in an attempt to protect the protein against ruminal degradation. Sheep received diets supplemented with 100 gjday of treated casein. Wool growth and the level of free amino acids in the plasma were compared with those of sheep receiving no supplement or untreated casein. A fourth group of sheep received a supplement of 1 gjday of methionine hydroxy analogue (MHA) mixed with 5 g of casein, the mixture being formalin treated after blending.Substantial wool growth increases from midside areas resulted from both the formalin-treated and the untreated casein supplements. Significant differences occurred in the levels of free citrulline, valine, leucine, histidine, proline, and ,-N-methyl lysine in the plasma. With each of these amino acids the untreated-casein supplemented sheep showed a small increase and the treated-casein group a larger increase when compared with the control group. No change in either wool growth or free amino acids resulted from the MHA supplement.

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Intravenous infusion of cysteine and wool growth of romney sheep

Cited by 10 publications

References 9 publications

Effect of formaldehyde treatment on the chemical composition and nutritive value of silage

Effect of formaldehyde treatment on the chemical composition and nutritive value of silage

Evaluation of formaldehyde-treated lucerne hay for protecting protein from ruminal degradation, and for increasing nitrogen retention, wool growth, live-weight gain and voluntary intake when fed to young sheep

Wool growth and plasma amino acid responses of N.Z. romney sheep to formalin-treated casein and methionine supplements

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