Liveweight gain and wool growth in sheep fed rations containing virginiamycin

1992 ◽  
Vol 32 (8) ◽  
pp. 1037 ◽  
Author(s):  
PJ Murray ◽  
JB Rowe ◽  
EM Aitchison ◽  
SG Winslow
Keyword(s):  
Feed Intake ◽  
Fibre Diameter ◽  
Barley Grain ◽  
Feed Additive ◽  
Feed Conversion ◽  
Merino Sheep ◽  
Growing Period ◽  
Wool Growth ◽  
Ad Libitum ◽  
Pelleted Diet

The feed additive virginiamycin was evaluated for its potential to improve wool growth and liveweight gain in Merino sheep in 2 experiments. In the first experiment 84 wethers (about 10 months old) were housed individually and fed ad libitum a pelleted diet based on lucerne chaff, lupin, and barley grain. Control sheep (28) were fed an unmedicated diet, and 14 in each of 4 groups were given diets containing 10, 20, 40, or 60 mg virginiamycin/kg pellets. Virginiamycin was found to reduce feed intake during the first 4-5 weeks of the experiment when included at levels 220 g/t. There was a dose-related reduction in liveweight gain. There was no significant effect of virginiamycin on wool growth. In the second experiment, weaners and adults from 2 locations in Western Australia, Mount Barker (relatively high rainfall) and Wongan Hills (relatively low rainfall and shorter pasture-growing period), were housed individually in a shed and fed a pelleted diet at rates equivalent to 3.5 and 3.1%, respectively, of liveweight for weaners and adults. The pelleted ration was based on wheat and lucerne chaff, lupin grain, and fishmeal. Virginiamycin was included at 20 mg/kg pellets for 16 of 40 sheep of each age and location. The remaining sheep were fed the unmedicated diet. Feed conversion and liveweight gain improved (P<0.05) in response to the inclusion of virginiamycin during the first 4 weeks of the trial, but wool growth was reduced over the same period. Virginiamycin had no effect on fibre diameter in sheep in either experiment.

Evaluation of feed additives for increasing wool production from Merino sheep. 2. Flavomycin and tetronasin included in lucerne-based pellets or wheaten chaff fed ad libitum

1989 ◽  
Vol 29 (3) ◽  
pp. 327 ◽  
Author(s):  
EM Aitchison ◽  
K Tanaka ◽  
JB Rowe
Keyword(s):  
Feed Intake ◽  
Volatile Fatty Acids ◽  
Rumen Fluid ◽  
Fibre Diameter ◽  
Feed Additives ◽  
Protein Diet ◽  
Merino Sheep ◽  
Wool Growth ◽  
Ad Libitum ◽  
Pelleted Diet

The feed additives flavomycin, a glycolipid antibiotic, and tetronasin, an ionophore, were evaluated for their ability to improve wool growth and liveweight gains in Merino sheep. Each was included in 2 diets: one was a pelleted mixture of (g/kg) lucerne (590), lupins (250) and barley (1 50); the other diet was wheaten chaff. Flavomycin was included in each diet at 10 and 20 mg/kg feed; tetronasin at 5 and 10 mg/kg feed. During an 8-week experimental period, the diets were fed ad libitum to weaner Merino wethers, with 15 sheep receiving each treatment diet at each level of additive inclusion, and 30 sheep receiving each diet without additives. Liveweight changes, feed intake and wool growth were measured over 2 consecutive 4-week periods, and rumen fluid samples were taken from all sheep after 6 weeks. Feed intake, liveweight gain and wool growth rate were all higher for animals eating the pelleted diets compared with those eating chaff. Rumen volatile fatty acids (VFA) and ammonia (NH3) concentrations were also higher with the pelleted diet. On the pelleted diet, flavomycin and tetronasin inclusion significantly increased liveweight gains during the second 4-week period (296, 277, 231 g/sheep.day for flavomycin, tetronasin and controls respectively, P<0.001), but neither additive had any significant effect on feed intake. The amount of clean wool grown during both measurement periods was greater for animals receiving flavomycin or tetronasin with the pelleted diet compared with control animals. Neither additive had any significant effect on liveweight gains or wool growth of sheep eating chaff. Fibre diameter (FD) was measured on wool clipped in the second period, and was not significantly altered by either additive: mean FDs for animal receiving pellets were 25.1 �m, compared with 18.5 �m for animals receiving chaff. Total rumen VFA concentrations were lower with flavomycin or tetronasin treatments on both diets, and ammonia concentrations were lower with both additives on the pelleted diet and with tetronasin on the chaff diet. It is concluded that both flavomycin and tetronasin were able to increase liveweight gains and wool growth in rapidly growing sheep eating a high-protein diet, but had little or no consistent effects with animals eating a lower quality, low-protein diet.

Feed efficiency for meat and wool production by Merino and F1 Dohne×Merino lambs fed pelleted diets of different nutritive value

2008 ◽  
Vol 48 (7) ◽  
pp. 879 ◽  
Author(s):  
D. Van Beem ◽  
D. Wellington ◽  
B. L. Paganoni ◽  
P. E. Vercoe ◽  
J. T. B. Milton
Keyword(s):  
Feed Efficiency ◽  
Nutritive Value ◽  
Fibre Diameter ◽  
High Energy ◽  
Meat Production ◽  
Feed Conversion ◽  
Wool Production ◽  
Wool Growth ◽  
Pelleted Diet ◽  
Western Australian

There is anecdotal evidence from Western Australian breeders that Dohne sheep maintain a higher level of meat and wool production than Australian Merinos. Feed efficiency, carcass and wool attributes are moderately heritable so we hypothesised there would be differences in these traits between Merino and F1 Dohne × Merino lambs. Two groups of 15 Merino and 15 F1 Dohne × Merino wether lambs (29–40 kg) were fed a pelleted diet of either moderate or high energy and protein content for 48 days. Ad libitum pellet intake and liveweight gain were measured and the feed conversion ratio (FCR) for both wool growth and liveweight were calculated. Wool growth and quality were measured and the lambs were slaughtered to measure carcass and meat quality attributes. The F1 Dohne lambs were heavier at the start of the study and grew faster than the Merinos (P < 0.05) irrespective of diet. Consequently, the carcasses of the F1 Dohne lambs were heavier than the Merinos (P < 0.001), but the differences in FCR were not significant. Merino lambs produced more clean wool of lower fibre diameter from less feed than the F1 Dohne lambs (P < 0.05). These results suggest that F1 Dohne × Merino lambs may have an economic advantage in terms of meat production, but this is traded-off against wool production.

Supplementation of young Merino sheep grazing annual pastures with lupin, barley grain, or silage

1993 ◽  
Vol 33 (4) ◽  
pp. 403 ◽  
Author(s):  
JJ Gardner ◽  
PT Doyle ◽  
JB Rowe ◽  
R Hetherington ◽  
P Spicer ◽  
...  
Keyword(s):  
Growth Rate ◽  
Energy Levels ◽  
Fibre Diameter ◽  
Barley Grain ◽  
Sheep Grazing ◽  
Merino Sheep ◽  
Wool Growth ◽  
Metabolisable Energy ◽  
Staple Strength ◽  
Fleece Weight

We examined the effects on liveweight change and wool production of supplements of lupin, barley grain, or silage given to Merino weaners (age 5-7 months; starting weight about 30 kg) grazing dry annual pastures. In experiment 1, each supplement was offered at 5 rates (g/sheep.day): lupin, air-dry, 75-450; barley, air-dry, 80-480; silage, fresh, 430-2580. Sheep on all treatments gained weight in the first 29 days of supplementary feeding, with no effect of rate of supplementation (lupin 97 g/day; barley 57 g/day; silage 74 g/day). Those receiving no supplement also gained weight (40 g/day). Different supplements were not compared because the energy levels of lupin and barley were not measured. Over the next 48 days, liveweight changes increased (P<0.001) linearly with rate of feeding of lupin (25 � 2.1 g/100 g) and barley (12 � 0.8 g/100 g). The trend with silage (11 � 5.0 g/kg) was not significant. Taken over the 77 days, liveweight changes increased (P<0.01) linearly with rate of feeding for lupin (20 �. 1.8 g/100 g), barley (8 �. 1.7 g/100 g), and silage (10 �. 2 g/kg). There were no significant (P>0.05) differences associated with the rate of supplementation for annual clean fleece weight (lupin 3.43 kg, barley 3.37 kg, silage 3.30 kg) or mean fibre diameter of the 12-month fleece (lupin 22.2 �m, barley 22.6 �m, silage 22.1 �m). In experiment 2, sheep were given no supplement, lupin, barley, or lupin and barley mixtures (metabolisable energy ratio, 1:3,1:1,3:1). All supplements increased liveweight change (P<0.01) and clean wool growth rates (P<0.05) compared with no supplement. There was also a trend towards an increase in total wool grown by supplemented sheep (3.8 - 4.00 v. 3.73 kg). Liveweight change during the first 71 days of feeding increased (P<0.01) as the proportion of lupin in the supplement increased, with no effects in the final 70 days of supplementation. During supplementation, clean wool growth rate increased (P<0.05) as the proportion of lupin in the mixture increased, but there was no significant effect on the total amount of wool grown over 12 months or on mean fibre diameter. Supplements resulted in increased (P<0.001) staple strength when compared with controls (21-25 v. 14 N/ktex).

Conditions under which flavomycin increases wool growth and liveweight gain in sheep

1992 ◽  
Vol 43 (2) ◽  
pp. 367 ◽  
Author(s):  
PJ Murray ◽  
SG Winslow ◽  
JB Rowe
Keyword(s):  
Age Groups ◽  
Fibre Diameter ◽  
Feed Additive ◽  
Climatic Region ◽  
Adult Sheep ◽  
High Rainfall ◽  
Growing Period ◽  
Wool Growth ◽  
The One ◽  
Different Sources

Flavomycin, a glycolipid feed additive, was evaluated for its potential to improve wool growth and liveweight gain in sheep of two ages and from two different sources. Sheep came from two locations in the Mediterranean climatic region of Western Australia's agricultural area-Mount Barker, with a relatively high rainfall and Wongan Hills with a relatively low rainfall and shorter pasture growing period. Forty weaner sheep, from each source, initially eight months of age and with a mean liveweight of 29 kg (s.e. � 0.3) were studied. There were also 40 adult sheep, from each source, initially 20 months of age with mean liveweights (Wongan Hills) 42 kg (s.e. �0.5) and (Mount Barker) 51 kg (s.e. � 0.7). All animals were housed individually in the one shed and fed a pelleted ration at a level equivalent to 3.1% (weaner) and 3.5% (adult) of each animal's liveweight. The pelleted ration was based on wheat and lucerne chaff, lupin grain and fishmeal. Flavomycin was included at 20 mg/kg pellets and there were 16 sheep of each age and source fed this medicated diet. Twenty-four sheep were fed the unmedicated diet. Wool growth was increased by flavomycin by 14.5% (P < 0.05) but only in adult sheep from Mount Barker. Inclusion of flavomycin in the diet increased liveweight gain in sheep of both ages and from both sources. There was no significant effect of flavomycin on fibre diameter of wool in sheep from the different age groups and sources.

Insulin secretion, body composition and pig performance are altered by feeding pattern

2014 ◽  
Vol 54 (3) ◽  
pp. 319 ◽  
Author(s):  
Ronald E. Newman ◽  
Jeffery A. Downing ◽  
Peter C. Thomson ◽  
Cherie L. Collins ◽  
David J. Henman ◽  
...  
Keyword(s):  
Insulin Secretion ◽  
Feed Intake ◽  
Plasma Insulin ◽  
Feeding Strategy ◽  
Growing Pigs ◽  
Carcass Composition ◽  
Production Performance ◽  
Feed Conversion ◽  
Ad Libitum ◽  
Entire Male

Three studies investigated the effect of feeding strategy on production performance and endocrine status of growing pigs. For Experiment 1, 20 entire male pigs (70.0 ± 4.6 kg) were allocated randomly to individual pens in one of four climate-controlled rooms. Pigs were fed for 23 days either ad libitum or entrained to feed bi-phasically for two 90-min periods. For Experiment 2, 20 entire male pigs (41.2 ± 3.5 kg) were housed as per Experiment 1. Pigs were fed for 49 days either ad libitum or fed bi-phasically for two 60-min periods. For Experiment 3, 100 female pigs (66.1 ± 3.5 kg) were randomly allocated to individual pens within a commercial piggery and fed for 42 days either ad libitum or bi-phasically for two 60-min periods. Ear vein catheters were inserted into 10 pigs from each group and hourly blood samples were collected for 24 h in Experiments 1 and 2 and for 11 h in Experiment 3. Plasma insulin, non-esterified fatty acid and glucose concentrations were determined in Experiments 1 and 2, and glucose and insulin concentrations in Experiment 3. Feed intake and performance were recorded in all experiments and carcass composition was assessed by computed tomography for Experiment 2. There were no differences in final liveweight between the two treatment groups for all experiments. Pigs fed for two 90-min periods (Experiment 1) showed no difference in feed intake when compared with feeding ad libitum. Pigs in Experiment 2 fed for two 60-min intervals consumed 2.49 kg/pig.day compared with those fed ad libitum that consumed 2.68 kg/day (P = 0.057). In Experiment 3, pigs fed twice daily consumed 2.82 kg/pig.day compared with 2.91 kg/pig.day in ad libitum-fed pigs (P = 0.051). Bi-phasic fed pigs in Experiment 2 had improved (P < 0.05) feed conversion efficiency compared with pigs fed ad libitum. For all experiments, there was no difference in plasma glucose concentrations between the two treatments. In all three experiments, the circulating insulin concentrations for pigs fed ad libitum remained at a constant level throughout the sampling period. However, plasma insulin concentrations for the bi-phasic fed pigs significantly increased ~1 h after both feeding periods during all three experiments. Insulin secretion of pigs fed for two 90-min periods differed from that of pigs fed for two 60-min periods. Plasma insulin concentration increased five-fold following feeding for 60 min, compared with that in pigs fed for 90 min, which increased two-fold. Bi-phasic-fed pigs from Experiment 2 had reduced (P < 0.05) total carcass fat and significantly increased muscle when compared with pigs fed ad libitum. The data showed that feeding pigs at two succinct periods aligned insulin secretion to the time of feeding. Pigs fed for 60 min, unlike those fed for 90-min intervals, had reduced feed intake in comparison to those fed ad libitum. This may suggest that the duration of the feeding bout is important for this response and this may in turn influence both energy balance and the way energy is partitioned.

scholarly journals Post-weaning growth of cavies (Cavia porcellus) according to the inclusion level of ginger (Zingiber officinale) meal in the diet as a feed additive

2021 ◽  
Vol 14 (9) ◽  
pp. 3341-3352
Author(s):  
Loïc Arnold Mba Tene ◽  
Emile Miegoue ◽  
Marie Noëlle Bertine Noumbissi ◽  
Paulette Ntsafack ◽  
Camara Sawa ◽  
...  
Keyword(s):  
Feed Intake ◽  
Zingiber Officinale ◽  
Feed Additive ◽  
Cavia Porcellus ◽  
Feed Resources ◽  
Growth Performances ◽  
Ginger Powder ◽  
Inclusion Level ◽  
Ad Libitum ◽  
Growth Of Animals

The use of phytobiotics in feeding monogastric herbivores has several interests, including the stabilization of the caecal flora and especially the improvement of the growth of animals thanks to a better exploitation of feed resources. Thus a trial was conducted with an objective to evaluate the feed intake and post weaning growth performances of cavy according to the inclusion level of ginger meal. A total of 40 guinea pigs of 3 weeks of age were divided into 4 lots, and subjected to rations consisting of Trypsacum laxum served ad libitum, associated with the compound feed containing 0; 0.5; 0.75 and 1% ginger powder (T0, T1, T2 and T3). This study showed that the total intake of DM, MO and CB from forage was comparable between rations T0, T1 and T2 and significantly higher than those of ration T3. At weaning, average animal weights of all rations were comparable. However, at 8 weeks of age, the T0, T1 and T3 rations yielded comparable average weights, but significantly higher than those of the T2 animals, i.e., 272 g; 298.80 g; 285.25 g and 221.83 g, respectively. The T0, T1 and T3 diets recorded total gains that were comparable but significantly higher than those obtained with animals in Lot T2. Ginger powder can be included up to 0.75% in the diet as a feed additive for improved ingestion and 0.5% for post-weaning growth. L’usage des phytobiotiques dans l’alimentation des herbivores monogastriques présente plusieurs intérêts parmi lesquels la stabilisation de la flore caecale et surtout l’amélioration de la croissance des animaux grâce à une meilleure valorisation des ressources alimentaire. C’est ainsi que des essais ont été conduit avec pour objectif d’évaluer l’ingestion er la croissance post-sevrage des cobayes en fonction du niveau de la poudre de gingembre. Un total de 40 cobayes de 21 jours d’âge était reparti en 4 lots, et soumis à des rations constituées de Trypsacum laxum servi ad libitum, associé à l’aliment composé contenant 0 ; 0,5 ; 0,75 et 1% de poudre de gingembre (T0, T1, T2 et T3). Il ressort de cette étude que les ingestions totales de la MS, de la MO et de la CB du fourrage, ont été comparables entre les rations T0, T1 et T2 et significativement plus élevées que celle de la ration T3. Au sevrage, les poids moyens des animaux étaient comparables pour toutes les rations. Cependant à 8 semaines d’âge, les rations T0, T1 et T3 ont permis d’obtenir les poids moyens comparables, mais significativement plus élevés que ceux des animaux lot T2, soit respectivement 272 g ; 298,80 g ; 285,25 g et 221,83 g. Les rations T0, T1 et T3 ont permis d’enregistrer les gains totaux comparables, mais significativement élevés par rapport à ceux obtenus avec les animaux du lot T2. La poudre de gingembre peut être incluse jusqu’à 0,75% dans la ration comme additif alimentaire pour l'amélioration de l’ingestion et à 0,5% pour la croissance post-sevrage.

Methods of feeding growing pigs to maximise feed intake

1986 ◽  
Vol 1986 ◽  
pp. 128-128 ◽  
Author(s):  
A.L. Lightfoot ◽  
A.W. Armsby ◽  
C.F. Widdows
Keyword(s):  
Conversion Efficiency ◽  
Feed Intake ◽  
Growth Rates ◽  
Growing Pigs ◽  
Limited Information ◽  
Feed Conversion ◽  
Feeding Method ◽  
Genetically Improved ◽  
Ad Libitum ◽  
Ad Libitum Feeding

An experiment was carried out to determine which feeding method maximised feed intake of growing pigs and to record growth rates, feed conversion efficiency and backfat measurements. There is an increasing tendency for dry fed pigs to be fed ad libitum or to appetite in order to increase growth rates and throughput of building.Limited information is available on how the modern genetically improved pig will respond to high levels of feeding and whether ad libitum feeding will encourage higher feed intake than feeding to appetite either wet or dry.

Fibre diameter and staple strength of sheep selected for divergent clean fleece weight when subjected to an increase in intake or an increase in intake and diet change

2005 ◽  
Vol 56 (2) ◽  
pp. 195 ◽  
Author(s):  
M. A. Friend ◽  
G. E. Robards
Keyword(s):  
Growth Rate ◽  
Stepwise Regression ◽  
Fibre Diameter ◽  
Dietary Treatment ◽  
Diet Change ◽  
Wool Growth ◽  
Ad Libitum ◽  
Staple Strength ◽  
Fleece Weight ◽  
Ad Libitum Feeding

Merino wethers with a high (fleece plus, Fl+) or low (fleece minus, Fl–) potential for wool growth were offered a restricted intake of either oat grain or lucerne chaff for 8 weeks followed by ad libitum lucerne chaff for 4 weeks. The Fl– sheep that were fed oats then lucerne had a lower (P < 0.05) intake during the first 2 weeks of ad libitum feeding than all other groups. Staple strength of Fl+ sheep (37.5 ± 2.2 N/ktex) was less (P < 0.05) than that of Fl– sheep (44.5 ± 2.4 N/ktex), and dietary treatment did not significantly affect staple strength. Wool growth rate was unaffected by dietary treatment, but was greater (P < 0.001) for Fl+ (6.4 ± 0.2 µg/mm2.day) than for Fl– (4.0 ± 0.2 µg/mm2.day) sheep. Along-fibre variation in diameter was greater (P < 0.001) in Fl+ (15.6 ± 0.5%) than in Fl– (9.9 ± 0.5%) sheep. Between-fibre variation in diameter was greater (P < 0.001) in Fl+ (16.5 ± 0.5%) than in Fl– (13.2 ± 0.5%) sheep, and between-fibre variation in diameter was affected (P < 0.05) by dietary treatment in Fl+ sheep. Staple strength was significantly correlated (P < 0.05) with along-fibre variation in diameter (r = –0.48), and stepwise regression analysis indicated that along-fibre variation in diameter, wool growth rate during early restricted feeding, and minimum fibre diameter explained 63% of the variance in staple strength. The results are discussed in relation to the lower staple strength of Fl+ sheep.

The influence of protein quality on the effect of flavomycin on wool growth, liveweight change and rumen fermentation in sheep

1990 ◽  
Vol 41 (5) ◽  
pp. 987 ◽  
Author(s):  
PJ Murray ◽  
JB Rowe ◽  
EM Aitchison
Keyword(s):  
Protein Quality ◽  
Rumen Fluid ◽  
Initial Period ◽  
Fibre Diameter ◽  
Experimental Period ◽  
Feed Additive ◽  
Wool Production ◽  
Wool Growth ◽  
The Mean ◽  
Wheat Chaff

The feed additive flavomycin, a glycolipid antibiotic, was evaluated for its potential to improve wool growth in sheep fed two pelleted diets: one based on lucerne chaff and lupin grain and the other on wheat chaff and fishmeal. Seventy-eight weaner ewes, approximately 20 months of age and mean weight of 32 kg (s.e. � 0.3), were placed in individual pens and fed the pelleted diets at a level equivalent to 3.5% of the mean liveweight of the group. The experiment consisted of an initial period (8 weeks) during which all animals received their respective diets with no flavomycin, followed by an experimental period (9 weeks) during which the animals received their diets with flavomycin. Flavomycin was included at three different rates (l0, 20 and 40 ppm) in both diets (nine sheep/level) during the experimental period and twelve sheep were fed each of the unmedicated diets (no flavomycin). Feed intakes were measured daily and animals weighed weekly. Wool growth was measured for the initial and experimental periods by clipping a mid-side patch of about 100 cm2. In sheep fed the lucernellupin based diet, flavomycin increased liveweight gain ( P < 0.05) at 20 ppm but had no effect on wool production, whereas in those fed the hay/fishmeal diet, there was a linear decrease in liveweight gain (P < 0.001) (161, 151, 142, 130 g day-1) and a dose related increase in clean wool production (P<0.01) (12.9, 14.5, 15.2, 15.3 g m-2 day-1) with increasing rates of flavomycin (0, 10, 20, 40 ppm respectively). There was no significant effect of flavomycin on fibre diameter in the sheep fed either diet. The inclusion of flavomycin in both diets significantly increased the molar proportions of propionate in the rumen fluid and in sheep on the hay/fishmeal pellet it reduced the concentration of rumen ammonia. The time animals took to eat their ration was increased with the inclusion of flavomycin in the hay/fishmeal diet.

The use of thyroxine to reduce average fibre diameter in fleece wool when feed intake is increased

2001 ◽  
Vol 41 (5) ◽  
pp. 611 ◽  
Author(s):  
G. J. Lee ◽  
K. J. Thornberry ◽  
A. J. Williams
Keyword(s):  
Saline Solution ◽  
Daily Intake ◽  
Fibre Diameter ◽  
Fibre Length ◽  
Treatment Groups ◽  
Average Fibre Diameter ◽  
Wool Growth ◽  
Average Fibre ◽  
Ad Libitum ◽  
The Difference

An experiment was conducted to determine whether thyroxine injections would control the increases in fibre diameter when the wool growth of Merino wethers is stimulated by an increased supply of feed. Fifty-seven sheep were allocated to 1 of 5 levels of daily intake, ranging from 0.75 maintenance to ad libitum, and injected every third day with 3 mg of L-thyroxine or a saline solution (control). Sheep treated with thyroxine had elevated plasma tri-iodothyronine (T3) levels, which were highest in sheep fed the least (P<0.01). Ad libitum intakes of sheep treated with thyroxine tended to be higher than that of control sheep, particularly in the fifth to seventh weeks of the experiment, and liveweight gain over the initial 4 weeks was significantly (P<0.001) less. Wool growth was increased by thyroxine treatment, although the difference was small in the second half of the experiment at the highest intake levels. Fibre diameter of sheep treated with thyroxine was greater at low intakes, although the difference diminished as intake increased. Fibre length in the second half of the experiment was positively related to intake, but there were no effects of thyroxine. Although the relationships of fibre diameter and length with wool growth did not differ between the treatment groups, length accounted for more of the variation in wool growth in the second half of the experiment in treated wethers than in control wethers (0.376 v. 0.182 of the variation, respectively). Thyroxine did not appreciably reduce the extent of the increase in fibre diameter associated with an increase in the availability and intake of feed.

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