SHEARLING AND SECOND-YEAR CLEAN FLEECE WEIGHTS AS AN INDEX OF WOOL PRODUCTION IN THREE BREEDS OF RANGE SHEEP

1958 ◽  
Vol 38 (1) ◽  
pp. 53-60
Author(s):  
S. B. Slen ◽  
E. C. Banky ◽  
H. F. Peters
Keyword(s):  
Regression Coefficients ◽  
Reliable Estimate ◽  
Wool Production ◽  
Breed Differences ◽  
Mature Weight ◽  
Second Year ◽  
Selection For ◽  
Fleece Weight ◽  
Relationship Of ◽  
The Relationship

The relationship of shearling and second-year clean fleece weight to total wool production, i.e., first 5 years of life, was analysed in three breeds of range sheep (Canadian Corriedale, Rambouillet, and Romnelet) to determine its usefulness in selection for increased wool production.A correlation of +.67 (p <.01) between shearling clean fleece weight and the sum of the four mature fleece weights was obtained in the three breeds studied. When the first mature weight (second fleece) was correlated with the total weight of the three subsequent fleeces, the correlation was increased significantly (p <.01). Consequently, the second fleece appeared to be a more reliable estimate of lifetime production than shearling weight. No breed differences in these correlations were found when lifetime production was compared to shearling or to second-year fleece weights. The regression coefficients of lifetime production on shearling fleece weight showed that a shearling ewe which produced 1.0 lb. of clean wool above the average produced approximately 3.0 lb. more than the average during her productive life.Shearling fleece weight was found to represent 83, 77, and 80 per cent of the maximum mature fleece weight in the Canadian Corriedale, Rambouillet, and Romnelet, respectively. No breed differences were observed in this relationship.The repeatability of annual clean fleece weight was found to be.93,.83, and.76 for the Rambouillet, Romnelet, and Canadian Corriedale, respectively.

THE RELATIONSHIP OF CLEAN FLEECE WEIGHT TO AGE IN THREE BREEDS OF RANGE SHEEP

1958 ◽  
Vol 38 (1) ◽  
pp. 61-64 ◽  
Author(s):  
S. B. Slen ◽  
E. C. Banky
Keyword(s):  
Environmental Factors ◽  
Additional Increase ◽  
Maximum Production ◽  
The Third ◽  
Second Year ◽  
Fleece Weight ◽  
Relationship Of ◽  
The Relationship

A total of 1,457 clean fleece weights, representing 7 years of production and adjusted for certain environmental factors, were used in this study. The data were analysed to determine the relationship of clean fleece weight to age in the Rambouillet, Romnelet, and Canadian Corriedale breeds of range sheep maintained under Western Canadian conditions.In general, maximum fleece weight was attained by the second year of production and was maintained until the end of the fourth year in all breeds. At that time a significant (p <.01) decline occurred which continued until the end of the seventh year. Among the Rambouillet and Romnelet ewes which were born and raised as singles, a small additional increase in average fleece weight occurred in the third year. Ewes born and raised as singles tended to produce more wool than twins but the differences were significant (p <.01) only in the Romnelet shearlings. The data suggest that in twins maximum production occurred at a slightly earlier age and that the subsequent decline began sooner than in singles.

Body-weight-fleece-weight relationships in a strain of Merino sheep

1956 ◽  
Vol 7 (1) ◽  
pp. 57 ◽  
Author(s):  
PG Schinckel
Keyword(s):  
Body Weight ◽  
Body Surface ◽  
Unit Area ◽  
Merino Sheep ◽  
Wool Production ◽  
Significant Difference ◽  
The Mean ◽  
Fleece Weight ◽  
Relationship Of ◽  
The Relationship

The relationship of body weight to wool production was examined in a flock of Merino sheep of South Australian strain over a period of 7 years. In only one out of 10 groups examined was there a significant correlation between body weight and the amount of clean wool produced per unit area of midside skin. It is concluded that body weight and wool production per unit area of body surface are independent. In all groups there was a highly significant correlation between clean fleece weight and clean wool per unit area of body surface in the midside region. The regression of log fleece weight on log body weight was determined in 15 groups. In no case was the regression coefficient significantly different from 0.60. As the regression of log surface area on log body weight in sheep is of the order of 0.60, it is concluded that wool production is proportional to fleece-bearing surface. The mean regression coefficients of log fleece weight on log body weight, calculated within sire and year groups, were: rams, 0.52 ± 0.056; ewes, 0.61 ± 0.038; wethers, 0.30 ± 0.068. There were no significant differences between sires in the regression of log fleece weight on log body weight. There were, however, highly significant differences between sire groups in mean log fleece weight, after adjustment for differences in log body weight. Skin areas 3 by 3 cm were tattooed on the left midside of 24 lambs at 1 month of age. The wool produced on these areas, and the areas of the tattoos, were measured at 4-monthly intervals from 4 months of age until 28 months. The amount of wool produced m7as proportional to the area in each of the six periods. There was also a highly significant difference between periods and between sheep in the amount of wool produced after adjustment for differences in tattoo area.

scholarly journals LAMB AND WOOL PRODUCTION FROM FIVE BREEDS ON RANGE

1966 ◽  
Vol 46 (1) ◽  
pp. 9-18 ◽  
Author(s):  
J. A. Vesely ◽  
H. F. Peters ◽  
S. B. Slen
Keyword(s):  
Body Weight ◽  
The Other ◽  
Production Traits ◽  
Weaning Weight ◽  
Wool Production ◽  
Breed Differences ◽  
Percentage Yield ◽  
Ewe Lamb ◽  
Fleece Weight ◽  
Staple Length

Rambouillet, Romnelet, Columbia, Targhee, and Suffolk sheep were evaluated under range conditions for the production of lamb and wool in the period 1960–1963. The production traits analyzed were: birth and weaning weight; face cover and neck wrinkling; fertility, prolificacy, weaned lamb production, and body weight of ewe; lamb survival to weaning; grease and clean fleece weight, staple length, wool grade, and percentage yield of clean wool by yearling and mature ewes.Lambs of Romnelet were lighter at birth than those of the other breeds. Targhee and Suffolk were the heaviest at birth. Romnelet and Columbia lambs were lighter at weaning than those of Rambouillet, Targhee, and Suffolk.Fertility, prolificacy, and weaned lamb production were essentially the same in the four range breeds. Suffolk produced more weaned lamb than the other four breeds. There were no breed differences in the survival of lambs.Columbia exceeded all other breeds in production of grease and clean fleece weight. Suffolk produced the smallest amount of wool. Staple length of Columbia ewes was 4.3, 7.5, 18.6, 23.7 mm longer than that of Romnelet, Targhee, Suffolk, and Rambouillet ewes.

The relationship between greasy fleece weight and clean fleece weight in the South Australian Merino

1961 ◽  
Vol 1 (1) ◽  
pp. 34
Author(s):  
GH Ford
Keyword(s):  
Genetic Variability ◽  
Covariance Analysis ◽  
The South ◽  
Weight Relationship ◽  
Different Seasons ◽  
Sire Group ◽  
Selection For ◽  
Fleece Weight ◽  
The Relationship ◽  
Australian Merino

The correlation between clean fleece weight and greasy fleece weight in South Australian strain Merino hoggets of both sexes in three widely different seasons was found to be Rams, 0.841, 0.890, 0.701 and Ewes, 0.846, 0.850 and 0.839. A covariance analysis of clean and greasy fleece weights showed no significant differences between slopes of individual sires, but significant differences between sire group means, indicating genetic variability for these two traits. It is concluded that the correlations are high enough to make selection for clean fleece weight by partial culling on the basis of greasy fleece weight, followed by scouring of midside samples of the fleece from the top sheep for greasy fleece weight, as advocated by Beattie (1956), practicable. The use of the clean fleece weight, greasy fleece weight relationship will rarely be sufficient on its own to formulate a selection plan. The conditions for the use of other aids to estimate clean fleece weight, such as the Neale squeeze machine, are discussed.

The relationship of hogg weight to the subsequent performance of Scottish Blackface ewes

1959 ◽  
Vol 1 (2) ◽  
pp. 107-111 ◽  
Author(s):  
A. F. Purser ◽  
R. C. Roberts
Keyword(s):  
Live Weight ◽  
Total Production ◽  
Subsequent Performance ◽  
Fleece Weight ◽  
Relationship Of ◽  
The Relationship

The relationship of six-month weight of sheep to their subsequent performance has been studied in a Scottish Blackface flock. The various aspects of performance considered were—live-weight of the ewe at tuppings, mortality and culling rates, fleece weight, lambing and weaning percentages and weight of lamb weaned. The regressions of these characteristics on sixmonth weight all declined with increasing age of the sheep and in any case only tupping weight, fleece weight and weight of lamb weaned had an association which was statistically significant. The results for each year of life of the sheep (up to drafting age at 6½ years) were subsequently combined to show how the total production of a flock of 1,000 ewes was related to the weight of the hoggs.

The effect of semen age on conception rate

1953 ◽  
Vol 43 (3) ◽  
pp. 256-259 ◽  
Author(s):  
R. C. Campbell
Keyword(s):  
Artificial Insemination ◽  
Conception Rate ◽  
Factors Affecting ◽  
Breed Differences ◽  
External Conditions ◽  
Relationship Of ◽  
The Relationship

1. The relationship of semen age to conception rate was studied at two artificial-insemination centres and a subcentre of one of these. Data relating to 50,213 first inseminations were included in the analysis.2. It is shown that external conditions can affect the rate of decrease of conception rate with semen age.3. Records giving c.r.'s for each day of semen age may reveal centre differences that cannot be detected in records giving mean c.r.'s only.4. Information may be lost if data are grouped by months rather than recorded by collections.5. The rate of decrease should not be used for comparing centres until the various factors affecting it (e.g. breed differences) are more fully understood. Further investigations should not be limited to one centre.

The Relationship of Infants' Physical Environment to Their Binet Performance at 21/2 Years

1978 ◽  
Vol 1 (1) ◽  
pp. 51-65 ◽  
Author(s):  
Theodore D. Wachs
Keyword(s):  
Physical Environment ◽  
Subsequent Development ◽  
Environmental Parameters ◽  
Interpersonal Interaction ◽  
Female Development ◽  
Interaction Variables ◽  
Second Year ◽  
Environment Parameters ◽  
Relationship Of ◽  
The Relationship

Most of the available evidence relating early experience to subsequent cognitive development has been concerned with interpersonal interaction variables. In the present paper the relationship of physical environment parameters to development was considered. Subjects were 23 infants who had previously taken part in a longitudinal project which included measurements of the child's physical environment between 12 and 24 months. These measurements were related to the infant's Binet performance at 31 months of age. Results indicated that some physical environment parameters including the presence of audio-visually responsive toys and a lack of overcrowding were related to subsequent Binet performance all across the second year of life. Other items were related to subsequent development only at certain time periods. A breakdown by sex suggested that female development was sensitive to environmental parameters at an earlier age than males and that females were uniquely sensitive to variety/change in their environment. Implications of these findings for early remediation were considered.

Relationship of Three Rock Parameters

2014 ◽  
Vol 986-987 ◽  
pp. 2176-2179
Author(s):  
Li Li Sui ◽  
Yong Ming Yang ◽  
Peng Liu ◽  
Jia Liang Chen ◽  
Zhi Shun Ge ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Surface Density ◽  
Regression Coefficients ◽  
Fracture Density ◽  
Surface Fracture ◽  
Two Parameters ◽  
Rock Brittleness ◽  
Relationship Of ◽  
The Relationship ◽  
Rock Parameters

In order to solve complex problems of traditional methods used to evaluate the rock fracability, the relationship between fractal dimension, rock brittleness and fracture density these three parameters was studied. The multiple linear regression is reasonable through nine kinds cores. The regression coefficients demonstrate both rock brittleness and surface fracture density play positive roles on fractal dimension value, the larger they are, the better the fracability. Therefore, the two parameters can be converted to consider only one parameter that is the fractal dimension of rock. The larger the fractal dimension, the better the fracability is, that is using fractal dimension represents brittle index and surface density to participate in fracability evaluation.

THE ACCUMULATIVE EFFECT OF FINNSHEEP BREEDING IN CROSSBREEDING SCHEMES: WOOL PRODUCTION AND FLEECE CHARACTERISTICS

1987 ◽  
Vol 67 (1) ◽  
pp. 1-11 ◽  
Author(s):  
MOHAMED H. FAHMY
Keyword(s):  
Fiber Length ◽  
Fiber Density ◽  
Wool Production ◽  
Genetic Groups ◽  
Wool Fibers ◽  
Shoulder Region ◽  
Fleece Weight ◽  
Positive Heterosis ◽  
The Relationship ◽  
Fiber Thickness

Wool fibers grown on 2 cm2 of skin were removed from the shoulder region of 273 female yearlings born at La Pocatiere Experimental Farm over a period of 3 yr. The yearlings represented nine genetic groups, Finnsheep, DLS (a population of 1/2 Dorset, 1/4 Leicester, 1/4 Suffolk) and seven combinations ranging from 1/8 to 7/8 Finnsheep breeding. The traits studied were staple length, fiber density, clean wool percentage, fiber length and thickness and their variability. Grease fleece weight (GFW) was recorded at first shearing on the 273 yearlings and on an additional 90 female yearlings. GFW was subsequently recorded at yearly intervals up to the 5th shearing. GFW of Finnsheep (F) was 2.3 kg for yearlings and averaged 2.0 kg for older ewes compared to 2.3 and 2.8 kg for the DLS, respectively. The crosses showed positive deviations from the expected means of their parental breeds, the highest was expressed in the [Formula: see text] and 5/8F crosses, GFW exceeded in many crosses that of the better parental breed. The relationship between GFW and the proportion of Finnsheep in the genetic group was linear in second shearing and curvilinear for later shearings. Significant linear relations were also observed in fiber thickness and variability in both fiber length and fiber thickness, whereas significant curvilinear relations were observed in clean wool percentage and fiber length. Compared to DLS, Finnsheep had a higher fiber density (1950 vs. 1551 cm−2), fibers were longer (19.1 vs. 15.8 cm) more variable in length (SD = 4.66 vs. 2.96 cm), finer (20.5 vs. 25.5 μm, and uniform in fiber thickness (SD = 4.8 vs. 5.9 μm), these differences being statistically significant. Most of the crosses exhibited positive heterosis particularly in clean wool percentage, staple and fiber length. The highest heterosis was often manifested in the [Formula: see text] cross. Key words: Wool production, fleece characteristics, crossbreeding, heterosis, Finnsheep, DLS sheep

The relationship of lamb birthcoat to adult fleece structure in a strain of Merino sheep

1958 ◽  
Vol 9 (4) ◽  
pp. 567 ◽  
Author(s):  
PG Schinckel
Keyword(s):  
Body Weight ◽  
Fibre Diameter ◽  
Merino Sheep ◽  
Gene System ◽  
Weight Yield ◽  
Fleece Weight ◽  
Relationship Of ◽  
The Relationship ◽  
Staple Length

Variability of the lamb birthcoat has been studied in relation to adult fleece characteristics. Coarse birthcoats were associated with increased variability of fibre diameter and decreased crimp rate. The increased variability of fibre diameter resulted from a significant increase in the diameter of primary fibres and a small, but statistically non-significant, decrease in the diameter of secondary fibres. There was no relation between birthcoat grade and body weight, clean fleece weight, yield, staple length, follicle density, follicle ratio, mean fibre diameter, or skin folds. It is postulated that there is a gene system in the Merino the effect of which is to cause variation in the amount of wool produced by the different follicle types. Increased "dosage" of genes of the system endows primary follicles with increased productivity and secondary follicles with decreased productivity. This is expressed in the form of increased halo-hair abundance in the lamb and increased differences between the diameters of primary and secondary fibres in the adult.

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