Sulfate supplementation of Angora goats: metabolic and mohair responses2

Abstract

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.

Effects of supplementation of inorganic sulfur on some biochemical parameters in Angora goat’s diet containing high nitrate levels

“…This result is compatible with reports that there were no changes in live weight among cattle fed with rations containing high levels of nitrate (16). The result obtained in the NS group is also consistent with reports that the addition of sulfur to the ration did not affect the live weights of Angora goats (13).…”

Effect of sex and rearing system on the quality and mineral content of fiber from raeini cashmere goats

“…These sulfur-containing amino acids are effective in the activity of fiber producing follicles and thus stimulate fiber growth and improve fleece quality in the sheep or goat [28,29]. …”

Feeding and Nutrition

“…9 The general recommendation is to maintain a 10:1 nitrogen-to-sulfur ratio in sheep and goat diets. It is found in high concentrations in wool and mohair, in keeping with the large amounts of sulfur-containing amino acids (cystine, cysteine, and methionine) in keratin.…”