scholarly journals The Growth and Composition of Wool V. Stimulation of Wool Growth by the Abomasal Administration of Varying Amounts of Casein

1969 ◽  
Vol 22 (3) ◽  
pp. 745 ◽  
Author(s):  
PJ Reis
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Sulphur Content ◽  
Wool Growth ◽  
Stimulation Of

In a series of five experiments, varying amounts of casein (60~200 gjday) were given to sheep, in the diet or via the abomasum, as supplements to various diets at several levels of intake (400~1200 gjday). Effects on growth rate and sulphur content of wool and on body weight were investigated.

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.

The influence of nutrition during winter on growth rate and sulphur content of wool of pregnant Scottish Blackface and Romney ewes

1970 ◽  
Vol 75 (1) ◽  
pp. 133-136
Author(s):  
J. M. Doney ◽  
C. C. Evans
Keyword(s):  
Growth Rate ◽  
Weight Change ◽  
Live Weight ◽  
Mean Value ◽  
Sulphur Content ◽  
Weight Increase ◽  
The Third ◽  
Wool Growth

SUMMARYPregnant ewes of the Scottish Blackface and Romney breeds were group fed to achieve different patterns of live-weight change between mating and parturition. One group had a net maternal live-weight increase of about 8%, the second a net loss of about 5% and the third a loss of about 16%. Wool growth and sulphur content of the wool were measured at intervals. During the period 6–8 weeks prepartum wool growth rate in the Blackface breed was low and there were no significant differences amongst treatments. Differences in sulphur content were highly significant (ranging between 3·97 and 3·46% for fine and coarse fractions respectively in the well-nourished sheep down to 3·68 and 3·20% in the undernourished group). In the Romney breed the situation was reversed. In the prepartum period there were no significant differences amongst groups in sulphur content (mean value 3·68%), but differences in wool growth rate were highly significant (0·021, 0·012 and 0·009 g/100 cm2/day).

The description and analysis of wool growth

1977 ◽  
Vol 28 (4) ◽  
pp. 737 ◽  
Author(s):  
BN Nagorcka
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Linear Regression ◽  
Least Squares ◽  
Ordinary Least Squares ◽  
Time Dependent ◽  
Recursive Least Squares ◽  
Growth Time ◽  
Body Weight Change ◽  
Wool Growth

Analyses of experimental estimates of the wool growth rate as a function of intake have previously been based on time-independent equations and linear regression with ordinary least squares. Some of these results are reanalysed with the assumption that the sheep is a dynamic system; hence a time-dependent description of wool growth is proposed. A recursive least squares technique has been used, and the results demonstrate that there is a 3½ week lag between intake and wool growth. Time-independent descriptions have not taken account of this and have led to the misconception that efficiency is a function of body weight change.

scholarly journals A Relationship Between Sulphur Content of Wool and Wool Production by Merino Sheep

1967 ◽  
Vol 20 (1) ◽  
pp. 153 ◽  
Author(s):  
PJ Reis ◽  
DA Tunks ◽  
OB Williams ◽  
AJ Williams
Keyword(s):  
Body Weight ◽  
Unit Area ◽  
Sulphur Content ◽  
Merino Sheep ◽  
Wool Production ◽  
Weight Index ◽  
Wool Growth ◽  
The Mean ◽  
Fleece Weight ◽  
The Relationship

The sulphur content of wool from 66 Peppin Merino wethers maintained together at pasture was measured in midside staples representing 49 weeks growth. The distribution of sulphur values was normal with a mean of 3�43 % and a range of 3�08-3�92 %. The sulphur content of the wool was inversely related to wool production among these sheep. There were no significant differences in the relationship when wool production was expressed as fleece weight index (F.W.I.), i.e. clean fleece weight/body weight (r = -0�48), as clean fleece weight (r = -0�42), or as wool growth per unit area of skin (r = - 0�37). The mean sulphur content of wool from sheep with the 10 highest values for F.W.I. was 3�27%, compared with a mean of 3 �55% sulphur for wool from sheep with the 10 lowest values for F.W.I.

N-[5-(4-Aminophenoxy)pentyl]phthalimide as a potential defleecing agent and its effect on wool growth

1980 ◽  
Vol 31 (4) ◽  
pp. 791
Author(s):  
DA Tunks ◽  
RDG Rigby ◽  
AM Downes ◽  
JA Lamberton ◽  
BA Panaretto ◽  
...  
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Oral Dose ◽  
Feed Intake ◽  
Merino Sheep ◽  
Dose Rates ◽  
Wool Growth

Merino sheep, offered feed at two levels of intake, were given an oral dose of N-[5-(4-am1nophenoxy)- pentyllphthahmide at rates varying over 100-800 mg/kg body weight. Consistent defleecing was obtained at dose rates of 400 nig/kg and above. Feed intake did not Influence defleecing activity. lntravenous infusion of smaller amounts also allowed defleecing. Wool growth rate following dosing was not affected by a dose of 100 mg/kg, but doses of 200 and 400 mg/kg caused depressions of c. 15 and c. 70% respectively in the rate of wool growth in the 2 weeks after dosing. Blindness was observed In one sheep dosed at 400 mg/kg and In all sheep dosed at higher rates

The influence of season and nutrition on the sulphur content of wool from Merino and Cheviot sheep

1968 ◽  
Vol 70 (2) ◽  
pp. 111-116 ◽  
Author(s):  
J. M. Doney ◽  
C. C. Evans
Keyword(s):  
Growth Rate ◽  
Nutrient Intake ◽  
Sulphur Content ◽  
Nutrient Cycle ◽  
Wool Growth ◽  
Seasonal Depression ◽  
The Difference ◽  
Cycle Group ◽  
The Relationship ◽  
Annual Amount

SUMMARYSulphur content, expressed as a percentage of clean dry wool weight, was measured at monthly intervals in two breeds of sheep, Cheviot and Merino x Cheviot backcross (¾ Merino, ¼ Cheviot), offered an equivalent annual amount of feed in three ways—constant level, natural grazing cycle and reversed grazing cycle. The relationships between S content and wool growth rate or nutrient intake differed with both breed and nutrient cycle, but all the results could be explained satisfactorily on the basis of a constant optimum composition for each individual with sulphur impoverishment related to lack of balance between follicle activity rate and high-S substrate availability.The difference in mean maximum S content between breeds (3·87% and 3·81% for Cheviot and ‘Merino’ respectively) was much smaller than the difference between individuals within the breeds (4·05·3·72% and 3·92·3·66%). The seasonal depression within individuals varied with nutrition and wool growth rate, Cheviot sheep showing the greatest depression and lowest values (2·89 and 3·28% for Cheviot and 'Merino, respectively in the reversed cycle group). There was no consistent seasonal trend in the relationship between clean and unscoured wool weight.

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

1969 ◽  
Vol 22 (6) ◽  
pp. 1507 ◽  
Author(s):  
WF Colebrook ◽  
PJ Reis
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Weight Gain ◽  
Body Weight Gain ◽  
Nitrogen Retention ◽  
Wool Growth ◽  
Egg Protein ◽  
Relative Value ◽  
Egg Albumen ◽  
Whole Egg

Supplements (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.

Seasonal fluctuations in wool growth in south Western Australia.

1961 ◽  
Vol 1 (2) ◽  
pp. 85 ◽  
Author(s):  
AM Stewart ◽  
RJ Moir ◽  
PG Schinckel
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Western Australia ◽  
Seasonal Fluctuation ◽  
Seasonal Fluctuations ◽  
Merino Sheep ◽  
Wool Production ◽  
Wool Growth ◽  
Climatic Environment

The growth rate of wool was measured at monthly intervals for a period of two years in four groups totalling forty Merino sheep, maintained under typical farm conditions in a Mediterranean climatic environment. Marked seasonal fluctuation in wool growth was found in all sheep. The highest level of clean wool production, 85 attained in the spring months, was nearly three times that of the lowest level, which occurred in the autumn. The rate of wool growth fluctuated independently of body weight. Wool growth fell steep4 while bob weight was maintained; wool growth subsequently rose sharply while body weight increased relatively slowly. The factors responsible for the observed fluctuation in the rate of wool growth are discussed and the conclusion reached that lack of useful energy and protein, in the summer and autumn grazing is probably the principal cause of the decline in rate of wool growth in these months.

METABOLIZABLE ENERGY CONTENT OF POULT STARTER RATIONS AS AFFECTED BY ANTIBIOTIC SUPPLEMENTATION

1966 ◽  
Vol 46 (1) ◽  
pp. 37-40 ◽  
Author(s):  
R. M. Blakely ◽  
H. I. MacGregor
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Energy Content ◽  
Dietary Treatment ◽  
Basal Diet ◽  
Metabolizable Energy ◽  
Procaine Penicillin ◽  
Turkey Poults ◽  
Stimulation Of

A practical type basal poult starter was supplemented with 17.6 p.p.m. procaine penicillin, and 4 p.p.m. oleandomycin to provide three experimental diets. These were fed to turkey poults from day-old to 38 days of age. Each of the antibiotic-supplemented diets resulted in a significant increase in body weight at 13, 27, and 38 days of age when compared with the unsupplemented basal diet. Metabolizable energy values of the supplemented diets did not differ significantly from that of the control ration. These results confirm previous reports that the stimulation of growth rate of turkey poults as a result of dietary treatment, and in particular antibiotic supplementation, is not necessarily associated with an increase in metabolizable energy values of the diets.

Evaluation of formaldehyde-treated casein for wool growth and nitrogen retention

1969 ◽  
Vol 20 (4) ◽  
pp. 775 ◽  
Author(s):  
PJ Reis ◽  
DA Tunks
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Weight Gain ◽  
Nutritional Value ◽  
Body Weight Gain ◽  
Nitrogen Retention ◽  
The Other ◽  
Average Increase ◽  
Basal Rate ◽  
Wool Growth

Four sheep were given three types of casein supplements (all providing c. 16 g nitrogen per day) and the effects on wool growth rate, body weight gain, and nitrogen retention were measured. The supplements were untreated casein in the diet, untreated casein per abomasum, and formaldehyde-treated casein in the diet. Untreated casein in the diet was inferior to the other casein supplements for all parameters studied. Formaldehyde-treated casein and casein per abomasum were of similar nutritional value. The average increase in wool growth rate above the basal rate was 62% for both types of supplement; nitrogen retained was about 3 g/day, of which more than half was in wool. The treated casein was 90% digestible.

Sign in / Sign up

Export Citation Format

Share Document