Sulfur and Methionine Metabolism in Sheep. II. Quantitative Estimates of Sulfur Metabolism in the Sheep's Stomach

Doyle, PT; Moir, RJ

doi:10.1071/bi9790065

Cited by 17 publications

(5 citation statements)

References 26 publications

(43 reference statements)

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“…Sulfide absorbed into blood is oxidized in blood and liver to sulfate for excretion via urine and recycling to rumen via saliva (Bray and Till, 1975). The S metabolism models presented by Doyle and Moir (1979) show that up to 40% of dietary S with a n alfalfa diet and most of the supplementary methionine S are not used by the microbes. The observed range of ruminal fluid sulfide-S concentrations is between .6 and 288 mg/ L (Bray and Till, 1975).…”

Section: Resultsmentioning

confidence: 99%

Sulfate supplementation of Angora goats: metabolic and mohair responses2

Owens

et al. 1992

Journal of Animal Science

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Eight castrated male Angora goats were used in a repeated, simultaneous 4 x 4 Latin square designed experiment to evaluate metabolic and mohair responses of Angora goats to sulfate supplementation. Goats had ad libitum access to isonitrogenous diets containing a .16 (basal), .23, .29, or .34% S (DM basis), which yielded N:S ratios of 12.7, 8.3, 6.8, or 5.5:1. Feed intakes were not affected (P greater than .20) by dietary S level. Quadratic increases (P less than .05) to S supplementation were observed in grease and clean mohair production, grease and clean staple strength, and staple length. Mohair diameter, med fiber, kemp fiber, S, and cysteine contents were not affected (P greater than .05) by supplemental S. Averaged across the prefeeding, 2, 4, and 6 h postprandial sampling times, ruminal pH, ammonia N, total S, organic S, protein S, and plasma urea N and organic S concentrations were quadratically increased (P less than .05) by supplemental S. Ruminal sulfate S, total sulfide S, and plasma sulfate S were linearly increased (P less than .05) by supplemental S. Retention of N and mohair S yield exhibited quadratic increases (P less than .05), but S retention exhibited a linear increase (P less than .001) with increased S intake. Calculated by regression, the optimum dietary S concentration for maximum clean mohair production was .267% of dietary DM for a N:S ratio of 7.2:1, suggesting that the National Research Council N:S ratio of 10:1 is inadequate for Angora goats. The optimum level of digestible S was calculated to be .18% of the diet DM.

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Section: Resultsmentioning

confidence: 99%

Sulfate supplementation of Angora goats: metabolic and mohair responses2

Owens

et al. 1992

Journal of Animal Science

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“…There is no information comparing the relative rates of dissimilation of methionine isomers by ruminal micro-organisms, or of the resulting metabolic products and their utilization. Doyle and Moir (1979b) found that ruminal supplements ofDL-methionine were almost completely degraded by the ruminal micro-organisms, and the small ruminal sulfide-sulfur pools (see Doyle and Moir 1979a) indicated that the rate of breakdown to sulfides and the subsequent absorption of these was extremely rapid. Sheep receiving ruminal infusions of the methionine isomers had similar sulfide-sulfur pools, and as the 'marker-corrected' sulfur flow at the duodenum with these treatments was similar to the control, there appears to be no difference in the extent of metabolism of the isomers in the reticulorumen.…”

Section: Discussionmentioning

confidence: 99%

“…51Cr-EDTA and l03Ru-phen were determined in rumen liquor, duodenal digesta and excreta as described by Tan et al (1971). Duodenal digesta were fractionated as described by Doyle and Moir (1979b). Ruminal sulfide-sulfur pools and 'marker-corrected' flows of sulfur at the duodenum were estimated as described by Doyle and Moir (1979a).…”

Section: Methodsmentioning

confidence: 99%

Sulfur and Methionine Metabolism in Sheep. V. Utilization of Methionine Isomers

Doyle¹

1981

Aust. Jnl. Of Bio. Sci.

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Merino wethers were fed 600 g dry matter per day of a ground and pelleted 50 : 50 oaten chaff: lucerne chaff diet. The ration was fed in 12 equal protions at 2-hourly intervals. The diet of some sheep was supplemented with infusions of 2�5 g/day of either L-, DL- or D-methionine into either the rumen or duodenum. Ruminal sulfide-sulfur pools, the amount of sulfur flowing at the duodenum and excreted in faeces and urine, and the amount of sulfur incorporated into wool were measured. [35Sl-LMethionine injections were given to each sheep and the excretion of [35Sl-sulfur and its incorporation into wool were measured.

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“…δ 34 S measures the amount of the essential amino acid methionine in bone collagen. Organisms cannot produce methionine on their own; rather, they acquire it via their diet through the methionine-containing sulphates present in groundwater, rain, and atmospheric sulfurous gases (Doyle and Muir 1979;Walton et al 1982). Consequently, an individual's δ 34 S signature is heavily influenced by region-specific environmental (Drucker et al 2011(Drucker et al , 2012 and geochemical (Nehlich et al 2011;Sayle et al 2013) processes, including the weathering of rock types and minerals, water circulation, and even modern pollution (Bocherens et al 2011;Case and Krouse 1980;Richards et al 2001).…”

Section: Archaeological Applications Of δ 34 Smentioning

confidence: 99%

Investigating Past Livestock Mobility Using δ34S Stable Isotopes: Three Preliminary Case Studies From Prehistoric Croatia

et al. 2022

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The benefit of including sulfur (δ 34 S) stable isotopes in studies of past human diet and migration is increasingly clear, but δ 34 S analyses remain underutilized in addressing other patterns of mobility, animal management, and environmental change in the archaeological record. Here we evaluate the ability of δ 34 S isotope values to act as proxies for prehistoric environments in three distinct regions of Croatia: northern Dalmatia, Lika, and central Croatia. We then assess if δ 34 S isotope values can highlight differences in herding and management practices of livestock in these areas, specifically those that encourage the movement of herds into various parts of the landscape (e.g., transhumance vs. localized grazing). Analysis of faunal stable isotope values from these geographically diverse sites constitute the first step in building an environmental database for Croatia and addressing questions of how δ 34 S can be applied to questions about animal husbandry in the archaeological record.

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Sulfur and Methionine Metabolism in Sheep. II. Quantitative Estimates of Sulfur Metabolism in the Sheep's Stomach

Abstract: The metabolism of dietary and supplemental DL-methionine sulfur in the stomach of sheep was studied in two experiments. In both experiments sheep were fed a 50 : 50 oaten chaff: lucerne chaff ration at two levels of intake, and some animals received intraruminal infusions of DL-methionine.

Cited by 17 publications

References 26 publications

Sulfate supplementation of Angora goats: metabolic and mohair responses2

Sulfate supplementation of Angora goats: metabolic and mohair responses2

Sulfur and Methionine Metabolism in Sheep. V. Utilization of Methionine Isomers

Investigating Past Livestock Mobility Using δ34S Stable Isotopes: Three Preliminary Case Studies From Prehistoric Croatia

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