The Growth and Composition of Wool IV. The Differential Response of Growth and of Sulphur Content of Wool to the Level of Sulphur-Containing Amino Acids given Per Abomasum

Reis, PJ

doi:10.1071/bi9670809

Cited by 81 publications

(69 citation statements)

References 12 publications

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“…data). Since wool growth is strongly governed by the amount of sulphur-contain- ing amino acids (SA A) absorbed from the small intestine (Reis & Schinckel 1964), the overall low rates of wool growth and the failure of the infusion treatment to increase wool growth suggest that dietary SAA was limiting even in the infused ewes.…”

Section: Wool Growthmentioning

confidence: 99%

Responses to abomasal infusions of casein plus methionine in lactating ewes fed fresh pasture

Barry¹

1980

New Zealand Journal of Agricultural Research

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Twin-bearing Romney ewes were fed fresh pasture of 80% organic matter digestibility (11.4 MJ ME per kg OM) and 3.5% N ad libitum for 6 weeks during early lactation. Eight of the 18 ewes were given a daily abomasal infusion of 95 g sodium caseinate and 2 g I-methionine. Voluntary pasture OM intake did not significantly differ between control and infused ewes. The infusions had no effect on milk secretion at peak lactation (week I), but the decline in net rates of protein and fat secretion as lactation progressed was less for infused than for control ewes. Wool production rates were low, and were unaffected by the infusion treatment. The quantity of amino acid N estimated to have been absorbed from the small intestine was respectively 85% and 110% of that required to sustain the levels of milk and wool production that were actually recorded in control and infused ewes. The absence of a difference in milk production between the two groups of ewes at peak lactation may have been due to greater mobilisation of body protein reserves by the control ewes. The higher plasma concentration of growth hormone observed in the infused ewes was probably implicated in their improved lactation persistency.

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Section: Wool Growthmentioning

confidence: 99%

Responses to abomasal infusions of casein plus methionine in lactating ewes fed fresh pasture

Barry¹

1980

New Zealand Journal of Agricultural Research

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“…Little and Mitchell (1967) obtained high nitrogen retentions with casein and soya bean proteins per abomasum, but obtained low values with zein and gelatin, an indication of the importance of amino acid composition. Reis and Schinckel (1964) found only a small response in wool growth rate with supplements of gelatin given per abomasum; the addition of cysteine or methionine increased the value of the gelatin supplement, but wool growth was still markedly inferior to casein.…”

Section: Introductionmentioning

confidence: 99%

“…These differences between protein sources may be due to differences in the extent of degradation in the rumen or to differences in the assemblage of amino acids absorbed from the intestines. Wool growth rates with these protein concentrates were low compared to those obtained with casein supplements given per abomasum (Reis and Schinckel 1964;Reis 1969). It has also been shown that, in contrast to oral supplementation, the abomasal or duodenal administration of casein results in enhanced nitrogen retention (Chalmers, Cuthbertson, and Synge 1954;Reis and Schinckel 1961;Little and Mitchell 1967;Schelling and Hatfield 1968).…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of results with abomasal supplements of casein and sulphurcontaining amino acids (S-amino acids), it was suggested by Reis and Schinckel (1964) that any good quality protein, available for digestion and absorption in the intestines, should stimulate wool growth. Preliminary results (Colebrook and Reis, unpublished data) with some protein concentrates infused into the abomasum have indicated differences between proteins in their value for wool growth; moreover those investigated appeared to be inferior to casein.…”

Section: Introductionmentioning

confidence: 99%

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Relative Value for Wool Growth and Nitrogen Retention of Several Protein Administered as Abomasal Supplements to Sheep

Colebrook¹,

Reis²

1969

Aust. Jnl. Of Bio. Sci.

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SummarySupplements (supplying c. 100 g protein per day) of whole egg protein, egg albumen, maize gluten, and gelatin were given to sheep via the abomasum and the effects on wool growth rate, body weight gain, and nitrogen retention were compared with those of casein.Casein supplements increased wool growth rate substantially (140-200%). Wool growth rates obtained with supplements of whole egg protein and egg albumen were approximately equal to those obtained with casein; maize gluten supplements resulted in less than half the response in wool growth rate obtained with casein, while gelatin supplements had little effect on the rate of wool growth.All protein supplements were at least 90% digestible, except for egg albumen, which was 60-80% digestible. All protein supplements, except gelatin, were effective in stimulating body weight gain and enhancing nitrogen retention; egg albumen appeared to be inferior to whole egg protein and maize gluten.

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“…The weight of clean dry wool was determined for each sample as described by Reis (1967). Three or four periods of growth were measured before and after each infusion.…”

Section: Measurementsmentioning

confidence: 99%

Effects of Lys-ß-urogastrone in vivo

Campbell¹,

Adams²,

Davey³

et al. 1988

Aust. Jnl. Of Bio. Sci.

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Lys-{1-urogastrone, an analogue of human {1-urogastrone with an additional N-terminal lysine, was shown to have similar effects in mice and sheep to mouse epidermal growth factor (mEGF). Lys-{1-urogastrone in doses of 0'18-3 ·24 "g g-I body weight caused both precocious separation of eyelids and eruption of incisors in neonatal mice.In 17 sheep, intravenous infusion of the urogastrone analogue over c. 24 h led, towards the end of infusion, to erythema of the muzzle, caused reductions in voluntary food intake (with doses ;;,050 "g kg-I) and generally easier manual harvesting of the fleece (with infusions ;;,081 "g kg-I), with spontaneous shedding of the fleece (c. 14 days after infusions of ;;,0 116 "g kg-I). In five sheep infusions of 25, 38, 50, 83 and 118 "g kg-I fleece-free body weight, plasma concentrations of lys-{1-urogastrone were near maximal 20 h after the infusions started and were, respectively, I· I, I· 7, 5· 5, 18 and 79 "g I-I plasma. Plasma concentrations of gastrin, somatostatin and pancreatic polypeptide were determined in these five sheep. Plasma gastrin rose sixfold by the end of infusions of 25 "g kg-I of the urogastrone analogue, and tenfold with the higher doses of infusion.Although plasma somatostatin concentrations were variable, a consistent trend was observed; lower levels were apparent during the lys-{1-urogastrone infusions. There was no discernible trend in pancreatic polypeptide concentrations.

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The Growth and Composition of Wool IV. The Differential Response of Growth and of Sulphur Content of Wool to the Level of Sulphur-Containing Amino Acids given Per Abomasum

Cited by 81 publications

References 12 publications

Responses to abomasal infusions of casein plus methionine in lactating ewes fed fresh pasture

Responses to abomasal infusions of casein plus methionine in lactating ewes fed fresh pasture

Relative Value for Wool Growth and Nitrogen Retention of Several Protein Administered as Abomasal Supplements to Sheep

Effects of Lys-ß-urogastrone in vivo

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