The influence of dietary supplements of DL-methionine on the growth rate of wool

1975 ◽  
Vol 26 (2) ◽  
pp. 337 ◽  
Author(s):  
PT Doyle ◽  
PR Bird
Keyword(s):  
Growth Rate ◽  
Dietary Supplements ◽  
Dry Matter ◽  
Nitrogen Retention ◽  
Growth Responses ◽  
Merino Sheep ◽  
Wool Growth

Dietary supplements of DL-methionine (0, 1.9, 3.8, 7.7 and 15.4 g per day) were given to five groups of 15-month-old Merino sheep (five per group) over an 8-week period. The roughage ration given (c. 840 g dry matter per day) comprised oaten chaff (78%), lucerne chaff (20%) and minerals (2%). Significant wool growth responses were obtained (18% above controls) when 3.8 g supplemental methionine per day was given. Changes in the rate of wool growth were paralleled by changes in nitrogen retention. Nitrogen retention was significantly increased above controls when 3.8 g supplemental methionine per day was given. Supplemental methionine did not affect liveweight gains.

Studies of wool growth responses to 2-hydroxy-4-(methylthio) butanoic acid, Alimet, an analogue of methionine

1990 ◽  
Vol 30 (4) ◽  
pp. 477
Author(s):  
RGA Stephenson ◽  
GR Suter ◽  
DA Pritchard ◽  
MDJ Martin
Keyword(s):  
Growth Rate ◽  
Drinking Water ◽  
Plasma Concentrations ◽  
Growth Responses ◽  
Butanoic Acid ◽  
Merino Sheep ◽  
Wool Production ◽  
Wool Growth ◽  
Dry Seasons

An analogue of DL-methionine, Alimet, was evaluated for its commercial potential for increasing wool growth in Merino sheep in pen and grazing experiments. This was done by administering Alimet as a drench, in drinking water, or via rumen or abomasal fistula, and measuring wool growth rate and plasma methionine concentrations. In vivo data indicated that significant wool growth responses (23-35%) to Alimet as a drench or in drinking water occurred at low rates (estimated 5-6 g/sheep.day) of basal wool production when sheep were fed a lucerne diet to maintain liveweight. At higher rates of clean wool growth (10-12 g/sheep.day) when sheep were eating above-maintenance diets (lucerne ration or pasture), Alimet treatment was associated with variable and reduced response. A significant (P<0.05) negative correlation (r2 = 0.699, n = 11) between wool growth responses (x � s.d. = 0.11 � 0.067) to the 3 mL dose rate of Alimet and wool growth in control treatments (y �: s.d. = 0.70 � 0.202) confirmed the above trend. Four hours after administration of Alimet via either rumen or abomasal fistula, comparative plasma concentrations of methionine, 28 and 168 �mol/L respectively, suggest that Alimet is susceptible to degradation in the rumen. The corresponding values for DL-methionine, via either rumen or abomasal fistula, were 64 and 350 �mol/L, respectively. The small rises (40%) in plasma methionine values associated with significant increases in wool production indicate that a dose of 3 mL is as effective as 4 mL of Alimet when the basal nutritional regime is limiting. While administration of Alimet in drinking water during dry seasons is possible, the profitability of supplementation would need to be tested further.

An evaluation of the micronization process for preparing cereals for the growing pig. 3. A note on the effect of micronization temperature on the nutritive value of wheat

1975 ◽  
Vol 20 (1) ◽  
pp. 167-170 ◽  
Author(s):  
T. L. J. Lawrence
Keyword(s):  
Growth Rate ◽  
Dry Matter ◽  
Nutritive Value ◽  
Nitrogen Retention ◽  
The Other ◽  
Growing Pig ◽  
Significant Depression ◽  
Conversion Study

SUMMARY1. In two experiments the nutritive value for the growing pig of wheat which had been micronized at temperatures of 155°, 190° or 220°C, flaked (rolled) and then ground was compared with wheat which had either been ground, or rolled and then ground.2. In the first experiment 60 pigs offered individually, restricted amounts of feed were used in a growth and efficiency of conversion study. In the second experiment 15 pigs were used in digestibility and nitrogen retention studies.3. The highest micronization temperature gave a significant depression in growth rate and in efficiency of conversion of dietary dry matter as compared with the other treatments for which there were no significant differences.

scholarly journals The Utilization of Abomasal Supplements of Proteins and Amino Acids by Sheep With Special Reference to Wool. Growth

1972 ◽  
Vol 25 (5) ◽  
pp. 1057 ◽  
Author(s):  
PJ Reis ◽  
WF Colebrook
Keyword(s):  
Amino Acids ◽  
Growth Rate ◽  
Nutritive Value ◽  
Body Weight Gain ◽  
Wheat Gluten ◽  
Nitrogen Retention ◽  
Wool Growth ◽  
Egg Protein ◽  
Egg Albumen ◽  
Whole Egg

Proteins of different amino acid composition (Promine-D, wheat gluten, and zein) were given as abomasal infusions to sheep and effects on wool growth rate, body weight gain, and nitrogen retention were compared with those of casein. These results were considered together with earlier data obtained for whole egg protein, egg albumen, maize gluten, and gelatin. The nutritive value of bloodmeal supplements was also studied. In addition the effects on wool growth of adding lysine and tryptophan to zein, and of adding leucine to casein, were examined.

scholarly journals The Relation Between the Responses of Wool Growth and Body Weight to Changes in Feed Intake

1962 ◽  
Vol 15 (4) ◽  
pp. 720 ◽  
Author(s):  
KA Ferguson
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Feed Intake ◽  
Weight Change ◽  
Productive Efficiency ◽  
Intake Rate ◽  
Body Weight Change ◽  
Growth Responses ◽  
Wool Growth

The wool growth responses to changes in feed intake are related to the changes produced in body weight. The relation is expressed by the equation W = Ei-kG, where W = wool growth rate, i = feed intake rate, G = rate of body weight change, and E and k are constants. The ratio of E to k in sheep of different productive efficiency was found to be constant.

A note on the effects of high levels of dietary calcium, phosphorus and sodium on nutrient utilization by sheep offered a roughage-based diet

1991 ◽  
Vol 53 (2) ◽  
pp. 249-252 ◽  
Author(s):  
M. F. J. van Houtert ◽  
R. A. Leng
Keyword(s):  
Dry Matter ◽  
Volatile Fatty Acids ◽  
Rumen Fluid ◽  
Nitrogen Retention ◽  
Live Weight ◽  
Nutrient Utilization ◽  
Wool Growth ◽  
Calcium Phosphorus ◽  
Mineral Concentrations ◽  
Male Sheep

Castrated male sheep were offered a roughage without (control sheep, no. = 8) or with calcium, phosphorus and sodium (CaPNa sheep, no. = 8; Ca, P and Na intake 34, 10 and 17 g/day per sheep respectively, given twice daily as drench). Food intake and live-weight change were unaffected. Water intake and urine excretion were higher whereas dry-matter apparent digestibility, nitrogen retention and wool growth were lower in the CaPNa sheep. The excretion of allantoin in urine indicated no differences in microbial protein absorption from the gut. There were small differences in the proportions of volatile fatty acids, numbers of protozoa and mineral concentrations in rumen fluid between the sheep in the two groups. Retentions of Ca, P and Na were higher in the CaPNa sheep, whereas retention of potassium was lower.

The influence of dietary protein and energy concentration on the growth of Merino weaner sheep

1980 ◽  
Vol 20 (104) ◽  
pp. 308 ◽  
Author(s):  
BA McGregor ◽  
JW McLaughlin
Keyword(s):  
Dry Matter ◽  
Nitrogen Retention ◽  
Dry Matter Intake ◽  
Energy Concentration ◽  
Digestible Energy ◽  
Treatment Groups ◽  
Wool Growth ◽  
Dietary Concentration ◽  
Energy Retention ◽  
Total Body

The influence of the dietary concentration of protein and energy on the growth of Merino wether weaners in pens, was studied in a factorial experiment. There were two digestible energy concentrations, (12.4 and 14.2 MJ DE kg-1 DM) x five protein concentrations (9-21% CP), three replicates (each of one animal). Diets were offered ad libitum, and nitrogen and energy retention were determined by the comparative slaughter technique. Initially, the mean weight of all treatment groups was 15.5 kg liveweight (12 weeks of age), and the experiment concluded 14 weeks later. Daily dry matter intake, liveweight gain, wool growth and total body nitrogen retention increased linearly as dietary crude protein concentration increased. Higher energy concentrations reduced dry matter intake and liveweight gain, and increased wool growth. Approximately 21 % of the digestible energy intake was retained. Regressions relating carcase and non-carcase composition to compartment weight, are presented. The fastest and most efficient gain in liveweight occurred with the ration containing 20% CP, at the lower energy concentration. It is suggested that for high levels of production with Merino weaners, rations should contain at least 18% CP.

Feed intake, liveweight and wool growth rate in Merino sheep with different responsiveness to low- or high-quality feed

2002 ◽  
Vol 42 (4) ◽  
pp. 399 ◽  
Author(s):  
N. R. Adams ◽  
D. Blache ◽  
J. R. Briegel
Keyword(s):  
Growth Rate ◽  
Feed Intake ◽  
Poor Quality ◽  
The Other ◽  
Synthesis Rate ◽  
Protein Synthesis Rate ◽  
High Quality ◽  
Merino Sheep ◽  
Wool Growth ◽  
Fleece Weight

A previous field trial using 30 sheep from each of 3 strains of Merino sheep (designated F, M and B) found that wool growth rate in strain B changed less throughout the year, compared with the other 2 strains. The present study examined components of liveweight loss on dry pasture with low protein and low digestibility to detect underlying relationships with the subsequent responsiveness of wool growth rate to young green pasture. Strain B lost less liveweight when grazed on dry (poor-quality) pasture, but lost more liveweight on sparse green pasture, than the other 2 strains. The rate of liveweight loss was not related to fatness on dry pasture, but was related to fatness on green pasture. The plasma concentration of leptin at the start of winter was related to clean-fleece weight (P<0.01). A second study examined the role of voluntary feed intake in strains M and B, offered low (56%�digestibility) and then high (70% digestibility) quality feed ad libitum in individual pens. Wool growth rate increased (P<0.001) on the better feed and tended to increase more (P = 0.06) in strain M. Feed intake increased (P�= 0.01) more in Strain M when offered good-quality feed. Fatness affected feed intake similarly in both periods. The results indicate 2 mechanisms that differed between feed conditions. First, sheep differed in their capacity to increase wool growth on high-quality feed, associated with the capacity to increase feed intake. Second, fatness was associated with the differential liveweight response to good or poor quality feed, although it was not clear whether it acted through appetite. It is hypothesised that the capacity to increase wool growth rate on good feed may be associated with a greater decrease in protein synthesis rate on poor quality pasture. This may result in a lower drive to eat and so a greater liveweight loss on poor pasture.

Response of lambs fed low quality roughage to supplements based on urea, cereal grain, or protein meals

2000 ◽  
Vol 51 (7) ◽  
pp. 811 ◽  
Author(s):  
R. M. Dixon ◽  
A. R. Egan
Keyword(s):  
Organic Matter ◽  
Dry Matter ◽  
Barley Grain ◽  
Barley Straw ◽  
Growth Responses ◽  
Protein Meal ◽  
Wool Growth ◽  
Linear Relationships ◽  
Cereal Grain ◽  
Metabolisable Energy

The intake and growth responses of lambs fed barley straw to a range of supplements provided on a 3- or 4-day cycle were examined. Supplements were urea and sulfur (N/S) added to the straw, or 3 increments of each of 3 approximately isonitrogenous supplements consisting of barley grain mixed with urea and sulfur (Bar/N), cottonseed meal (CSM), and a 0.4 : 0.6 mixture of fishmeal and lucerne hay (FM/L). Lambs fed straw alone consumed 38.3 g dry matter (DM)/kg W0.75 day of straw and an estimated 2.54 MJ metabolisable energy (ME)/day, and lost 20 g liveweight (LW)/day. Supplementation with N/S increased estimated ME intake by 32%. Substitution rates of Bar/N, FM/L, and CSM supplements for straw were 0.50, 0.36, and 0.25 g/g, respectively, but these rates did not differ (P > 0.05) between supplements. Digestibilities of organic matter (OM) and neutral detergent fibre (NDF) were affected differently depending on both the type and amount of supplement. Estimated ME intake was increased 7.1, 7.9, and 8.6 kJ/g supplement DM by Bar/N, FM/L, and CSM, respectively. LW gain and wool growth were increased (P < 0.01) by consecutive increments of each of the supplements, and were increased more (P < 0.01) by the FM/L and CSM than by the Bar/N supplement. The slopes of the linear relationships between LWgain and estimated ME intake were greater (P < 0.05) for CSM and FM/L than for Bar/N supplement, ingested ME being used with about twice the efficiency for LW gain when the protein meal supplements rather than the cereal grain–urea supplement was fed. However, across all supplement treatments, LW gain was correlated (r = 0 .9 1 ; P < 0.001) with the absorbed amino acid supply as estimated from feeding standards. In conclusion, although supplements based on either cereal grain or protein meals increased LW gain in these young lambs, there were much greater responses to the protein meals due principally to more efficient utilisation of ingested ME for LW gain.

scholarly journals The effect of different pasture management strategies in north-west Queensland on liveweight gain and wool growth rate of several groups of young sheep.

1985 ◽  
Vol 7 (2) ◽  
pp. 75 ◽  
Author(s):  
RGA Stephenson ◽  
DA Pritchard ◽  
PM Pepper ◽  
PT Connelly
Keyword(s):  
Growth Rate ◽  
Dry Matter ◽  
Management Strategies ◽  
Live Weight ◽  
Dry Season ◽  
Wet Season ◽  
Pasture Management ◽  
North West ◽  
Wool Growth ◽  
Significant Difference

The effect of three different pasture management strategies on liveweight gain and wool growth rate of young(weaner) sheep was examined immediately after weaning on Mitchell grass-Flinders grass pastures during the dry season of north-west Queensland. The pasture management strategies were designed to mimic various industry situations, while the performance of four different progeny groups was compared and used to provide an overall assessment of pasture quality. Pasture treatments (experiment 1) consisted of three paddocks, a harvested (c. 8% of pasture harvested and baled) and spelled, a spelled, and a continuously grazed paddock. Spelled paddocks were not grazed during and after the wet season for a period of six months while the continuously grazed paddock was continuously stocked before the experiment. Experiment 2 consisted of spelled and continuously grazed paddocks. Pastures were evaluated by measuring the changes in composition and quality (experiment 1) and the responses in liveweight gain (experiments 1 and 2) and wool growth of the weaners (experiment 1). Marked improvements (c. 100%) in weaner growth rates occurred in the spelled paddocks. Greasy wool production by three groups of ewes in experiment I was about 14% greater in the harvested paddock than in the others. At the start of the trial there were no significant differences in dry matter yield but a significant difference in botanical composition occurred between paddocks. The changes in dry matter that occurred between the beginning and end of grazing were not significantly different between paddocks. Before gazing, forbs made up approximately 16%, 4% and 1% of pastures in harvested, spelled and continuously grazed paddocks respectively. The change in the percentage forbs that occurred between the beginning and end of the grazing period was significantly greater in the harvested paddock than in the other paddocks indicating preferential selection and intake by sheep. The differences in weaner live weight and wool growth between paddocks suggest that paddock management can improve weaner productivity. The study also indicates that paddock management could be successfully used to increase the percentage of forbs and quality of the pasture during the dry season. The superior wool growth of two progeny groups also suggests that improved productivity of breeding flocks in the tropics is possible if superior sheep can be identified. The results highlight the importance of preferential management of pasture for weaners so that productivity advantages can be exploited.

Effects of nutrition and paring on linear hoof growth in sheep

1990 ◽  
Vol 41 (1) ◽  
pp. 197
Author(s):  
JL Wheeler ◽  
HI Davies ◽  
DA Hedges ◽  
PJ Reis
Keyword(s):  
Growth Rate ◽  
Ambient Temperature ◽  
Direct Effect ◽  
Growth Rates ◽  
Dry Matter ◽  
Latin Square ◽  
Residual Effects ◽  
Wool Production ◽  
Wool Growth ◽  
Nutritional Changes

Paring increased the linear hoof growth on the forefeet of Merino wethers by an average of 4.1% (P < 0.05) with a tendency for paring to promote faster growth on the medial digits. Effects of feeding these sheep with 400, 600, or 1000 g pelleted ration day-1 were assessed in a 4 X 4 Latin square design with 28-day periods using four measures of response. An extra (fifth) period was used to determine residual effects. The proportion of residual (carryover) to direct effect was much smaller for hoof growth than for wool. Hoof growth was not related to wool production. In another experiment, hoof growth rate of sheep increased from 103 to 136 8m day-1 when the intake of digestible dry matter was increased from 400 to 600 g day-1 (P< 0.001), and from 115 to 125 8m day -1 (P> 0.05) when the intake of digestible nitrogen was increased from 12 to 25 g day-1. Hoof growth rates of Merino wethers grazing native or sown pasture were not significantly affected by injecting DL-methionine daily into the abomasum. Hoof growth is not an appropriate index of wool growth. It may provide an easily measured, rapidly responsive and cumulative measure of nutritional changes, but its use cannot be recommended until more information is available on the factors that affect it and their interaction with ambient temperature.

Sign in / Sign up

Export Citation Format

Share Document