scholarly journals Comparative assessment of economically valuable traits of semi-coarse hair and coarse-hair sheep in Republic of Tuva

2021 ◽  
Vol 22 (5) ◽  
pp. 754-760
Author(s):  
S. S. Mongush
Keyword(s):  
Live Weight ◽  
Animal Husbandry ◽  
Comparative Assessment ◽  
Hair Sheep ◽  
Sheep Breeding ◽  
Ewe Lambs ◽  
Economically Valuable Traits ◽  
New Type ◽  
Ram Lambs ◽  
Agriculture And Food

In Republic of Tuva sheep breeding is a leading branch of animal husbandry. According to the Ministry of Agriculture and Food, the number of sheep is 980 thousand heads at the 1st of January 2021. Among them the percentage of Tuva-Saraja coarse-hair hybrids is more than 60%. The purpose of the work is to study economically valuable traits of Tuva-Saraja sheep of a new type in comparison with Tuva coarse-hair short-fat tailed sheep. For comparative assessment of live weight, dirty wool clip and length of wool according to the method of random sample, out of the herd there were selected 30 heads of ram lambs yearlings and 30 heads of ewe lambs yearlings of Tuva-Saraja semi-coarse-hair sheep of new type and Tuva coarse-hair short-fat tailed sheep. The results of research have shown, that rams and ewes yearlings of Tuva-Saraja semi-coarse-hair breed of new type significantly differ in size and wool productivity. They predominate over the lambs of the same age of Tuva coarse-hair short-fat tailed in live weight by 3.2-3.4 kg (9,7-10.2 %) statistically more, than Tuva coarse-hair short-fat tailed of the same age. The longest wool was recorded in rams yearlings of new type, with underwool of 7.8 cm that exceeded the length of underwool of Tuva ram lambs yearlings by 1.3 cm or 20.0 %, the top hair was 14.4 cm and exceeded the same index in analogues by 3,4 cm or 30.9 %. Tuva coarse-hair ewe lambs yearlings gave way to the semi-coarse-hair ewes of new type in the length of underwool and top hair. Thus, the rams and ewes yearlings semi-coarse-hair ewes of new type considerably differ in live weight, dirty wool clip and length of wool in comparison with Tuva coarse-hair short-fat tailed of the same age.

Effects of the percentage of Texel or Rouge de ľOuest genes in lambs on carcass characteristics and meat quality

1999 ◽  
Vol 69 (1) ◽  
pp. 81-92 ◽  
Author(s):  
A. F. Carson ◽  
B. W. Moss ◽  
R. W. J. Steen ◽  
D. J. Kilpatrick
Keyword(s):  
Meat Quality ◽  
Subcutaneous Fat ◽  
Carcass Characteristics ◽  
Live Weight ◽  
Fat Content ◽  
Carcass Weight ◽  
Ewe Lambs ◽  
Bone Content ◽  
Intermuscular Fat ◽  
Ram Lambs

AbstractThis study investigated the effects of the percentage of Texel or Rouge de l’Ouest (Rouge) genes in lambs (0, 50, 75 or 100%; the remainder being Greyface (Border Leicester × Scottish Blackface)) on lamb carcass characteristics and meat quality. Ewe lambs were slaughtered at 34, 40, 46 and 52 kg and ram lambs were slaughtered at 40, 46, 52 and 58 kg live weight. Dressing proportion increased (P < 0·001) by 0·53 and 0·27 g carcass weight per kg live weight for each 1% increase in Texel or Rouge genes respectively. Carcass conformation classification increased (P < 0·001) by 0·016 and 0·007 units (on a five-point scale) for each 1% increase in Texel or Rouge genes respectively. Carcass fat depth measures were reduced by Texel and Rouge genes such that at a constant fat depth end point, carcass weight could be increased by 0·029 and 0·023 kg for each 1% increase in Texel or Rouge genes. Carcass lean content increased (P < 0·001) by 0·99 and 0·27 g/kg for each 1% increase in Texel or Rouge genes. Subcutaneous fat content was reduced (P < 0·001) by 0·36 and 0·29 g/kg for each 1% increase in Texel or Rouge genes. Intermuscular fat content was reduced (P < 0·01) by 0·38 g/kg per 1% increase in Texel genes, whereas Rouge genes had no effect. Similarly, bone content was reduced (P < 0·01) by Texel genes only (0·31 g/kg per 1% increase in Texel genes). Warner-Bratzler shear force values showed a quadratic effect with increasing Texel and Rouge genes, with an initial decrease from 0 to 50% followed by an increase to 100%. Cooking loss increased (P = 0·05) as the percentage of Rouge genes in lambs increased. Increasing the percentage of Texel or Rouge genes significantly increased L* values (P < 0·01 and P < 0·05 respectively), b* values (P = 0·05 and P< 0·05 respectively) and H° values (P < 0·001).

Growth and body composition of Omani local sheep 1. Live-weight growth and carcass and non-carcass characteristics

1994 ◽  
Vol 58 (3) ◽  
pp. 365-372 ◽  
Author(s):  
O. Mahgoub ◽  
G. A. Lodge
Keyword(s):  
Alimentary Tract ◽  
Live Weight ◽  
Similar Rate ◽  
Weight Group ◽  
Ewe Lambs ◽  
Weight Growth ◽  
Early Maturing ◽  
Good Potential ◽  
Ram Lambs ◽  
Omental Fat

AbstractForty-five local Omani ram, wether and ewe lambs were reared from birth until slaughter at 18, 28 or 38 kg live weight (five of each ‘sex’ at each weight group) on an ad libitum concentrate diet and Rhodesgrass hay.Ram lambs grew faster from birth and reached predetermined slaughter weights earlier than wether and ewe lambs. At 28 kg live weight, ram lambs had: heavier heads, feet, reticulo-rumens and livers; higher muscle and bone and lower fat proportions in the carcass; lower muscle: bone and higher muscle: fat ratios; higher proportions of carcass but lower non-carcass fat than had wether and ewe lambs. The head, feet, alimentary tract, liver and heart of Omani sheep grew at a lower rate; the skin grew at a similar rate and the carcass grew at a rate faster than empty body weight (EBW). Relative to EBW, muscle grew at a similar rate, fat faster and bone slower. Both carcass and non-carcass fats grew at a rate higher than that of the growth of EBW, with non-carcass fat growing at a higher rate than that of carcass fat. The growth rate of omental fat was the fastest followed by kidney, mesenteric, subcutaneous, tail, scrotal, intermuscular and pelvic fats respectively.This study demonstrated that Omani sheep have good potential for growth if they are managed and fed satisfactorily. Omani sheep are early maturing for which reason it is recommended that they be slaughtered at lighter weights to avoid higher fat content in the carcass. Castration in Omani sheep is not recommended for production of meat lambs under intensive systems as it resulted in reduced growth rates and deposition of excess fat at lower slaughter weights.

The effect of hexoestrol on growth, carcass quality, endocrines and reproductive organs of ram, wether and female lambs

1960 ◽  
Vol 2 (01) ◽  
pp. 11-25 ◽  
Author(s):  
T. R. Preston ◽  
Isoline Greenhalgh ◽  
N. A. MacLeod
Keyword(s):  
Live Weight ◽  
Reproductive Organs ◽  
Mammary Development ◽  
Seminal Vesicles ◽  
Control Group ◽  
Ewe Lambs ◽  
Group A ◽  
Ram Lambs ◽  
Group B ◽  
Group D

1. Two experiments were made. In Experiment 1, 124 ram, wether and ewe lambs were allocated to four equal groups as they reached a live-weight of 30 lb. Group A received no hexoestrol; group B were implanted with a 15 mg. pellet of hexoestrol and lambs of group C were given a second pellet of 15 mg. 35 days after the first. Group D were implanted with three 5 mg. pellets simultaneously in three different sites. The lambs were creep-fed while running with their dams on pasture and were killed as they reached a live-weight of 95 lb.In Experiment 2, 20 weaned ram lambs were allocated to a hexoestrol-implant group or a control group as they reached a live-weight of 40 lb. They were fed a pelleted ration indoors and were slaughtered at a live-weight of 110 1b.2. Length of teats and weight of the pituitary were significantly increased for all lambs treated with hexoestrol as compared with their controls. Excessive mammary development and one case of rectal prolapse were observed i n treated ewe lambs, while 3 of the treated rams in Experiment 2 had scrotal oedema.3. The rate of live-weight gain was greater for all hexoestrol-implanted lambs in Experiment 1 but less for the implanted lambs on Experiment 2 as compared with their respective controls. The differences just failed to attain significance at the 5% level.4. Dressing percentage was significantly reduced by hexoestrol treatment i n Experiment 1. On the other hand treated ram lambs in Experiment 2 had significantly higher dressing percentages and appeared to be fatter than the controls.5. Weights of testes and seminal vesicles in the ram and of the ovary in the ewe were decreased by hexoestrol treatment. Weights of seminal vesicles in the wether and of oviducts and uterus in the ewe were increased.

scholarly journals Effect of selected factors on basic reproduction, growth and carcass traits and meat production in Texel sheep

2011 ◽  
Vol 59 (5) ◽  
pp. 247-252 ◽  
Author(s):  
Ladislav Štolc ◽  
Martin Ptáček ◽  
Luděk Stádník ◽  
Marek Lux
Keyword(s):  
Litter Size ◽  
Carcass Traits ◽  
Live Weight ◽  
Meat Production ◽  
Data Set ◽  
Ewe Lambs ◽  
Fat Thickness ◽  
Ram Lambs ◽  
And Gender ◽  
Daily Gain

The objective of this work was to determine the effect of lambing year, sire effect, parity of ewes’ lambing (PL) and gender on selected indicators of meat production and fertility in a Texel sheep herd. The evaluation proceeded for a period of 5 years, when 356 ewe – lambs and 321 Texel ram – lambs were monitored. Processing of the data set was done by the SAS program, GLM procedure. The lambing year had a significant effect (P < 0.05; 0.01) on all indicators observed except litter size. The sire effect was found to be significantly (P < 0.05; 0.01) related to all indicators monitored. The significant differences (P < 0.01) were found in fat thickness and lambs’ muscularity. The frequency of lambs’ gender was not significantly affected by the litter size and number of lambs weaned. Lambs’ gender affected the MLLT depth of lambs nonsignificantly. Litter size, as well as the number of weaned lambs, increased with the higher PL (1.44 with primiparas, 2.17 with ewes at the 5th and subsequent lambings, P < 0.01; resp. 1.31 with primiparas, 2.01 with ewes at the 5th and subsequent lambings, P < 0.01). The live weight at 100 days of age was significantly lower in lambs from the 5th and following litters, as well as the daily gain from birth till 100 days of age (DG 100) and MLLT depth in comparison to the 2nd, 3rd and 4th litters (P < 0.05). On the average, ram – lambs reached a higher live weight at 100 days of age (+1.79 kg, P < 0.01), and DG 100 in contrast to female (+17.22 g, P < 0.01).

The effects of castration and of the poll gene on prime lamb production

1964 ◽  
Vol 4 (15) ◽  
pp. 386 ◽  
Author(s):  
WA Pattie ◽  
AC Godlee ◽  
PE Bouton
Keyword(s):  
Agricultural Research ◽  
Live Weight ◽  
First Grade ◽  
Taste Panel ◽  
Carcass Weight ◽  
Research Station ◽  
Agricultural Research Station ◽  
Ewe Lambs ◽  
Ram Lambs

During 1961 and 1962 experiments were conducted at Tamworth Agricultural Research Station to evaluate the effect of several castration treatments and of the poll gene on prime lamb production. Ram lambs and lambs sterilized by removal of the cauda epididymis had significantly heavier live weights at 16 weeks of age than did partially castrated lambs (half of each testis removed). These in turn were significantly heavier than wethers and ewes. Among single lambs, rams and sterilized rams had carcasses that were nine per cent heavier than those of wether and ewe lambs (P<0.01). With twins this difference was reduced to 1.3 per cent for wethers (n.s.) and eight per cent for ewes (P<0.05). The average carcass weight of partially castrated lambs was between these two groups. Mean horn volumes and preputial adhesion scores suggested that these lambs had less endogenous androgen than rams and sterilized lambs. All single lamb carcasses were classed as First Grade. There were no significant differences in the number of twin lambs that were down-graded in each treatment. Fifty-four per cent of the ram and sterilized ram carcasses were classed as Ram and would be subject to a price penalty regardless of their carcass grade. Taste panel tests of meat from the hind legs of wether and sterilized ram carcasses showed that the sterilized ram meat was slightly more acceptable. There were no significant differences in live weight, carcass weight or carcass grade between polled and horned lambs.

Efficiency of breeding of multiparous sheep of the new genotype

2020 ◽  
Vol 1 (4) ◽  
pp. 41-48
Author(s):  
N. I. Kravchenko ◽  
Keyword(s):  
Multiple Pregnancy ◽  
Live Weight ◽  
Comparative Assessment ◽  
Domestic Sheep ◽  
Sheep Breeding ◽  
Slaughter Weight ◽  
New Genotype

The paper provides a comparative assessment of the productivity of multiparous sheep of a new genotype with animals of the original breeds in order to show the possibility of converting domestic sheep breeding from a loss-making industry to a profitable one. The superiority of the new genotype over peers of fine-wool breed is: for the production of lamb in live weight of 174–183% to (40–45 kg per initial sheep, 71–74,5 kg per ewe), slaughter weight 20% and profitability 104–117 absolute percentages (up to +165, +178%) due to an increase in multiple pregnancy by 158,1–162,4% (1,85–1,90 lambs from one ewe).

Effects of sex and gonadectomy on the growth and development of Southdown × Romney cross lambs. Part I. Effects on live–weight growth and components of live weight

1966 ◽  
Vol 66 (1) ◽  
pp. 1-14 ◽  
Author(s):  
G. C. Everitt ◽  
K. E. Jury
Keyword(s):  
Weight Gain ◽  
New Zealand ◽  
Growth And Development ◽  
Live Weight ◽  
Carcass Weight ◽  
Male And Female ◽  
Live Weight Gain ◽  
Ewe Lambs ◽  
Weight Growth ◽  
Ram Lambs

The influence of sex and gonadectomy on liveweight growth and its components was examined in a comparative slaughter experiment using Southdown – Romney cross lambs run under New Zealand pastoral feeding conditions.Twenty ram lambs were castrated and 20 ewe lambs spayed at docking, at approximately 4 weeks of age. Ten ram and 10 ewe lambs were killed at this age and 5 lambs from each of the four ‘sexes’ (entire and gonadectomized, male and female) were killed 4, 8,12 and 24 weeks after docking.Live-weight gain was higher for males than females and higher for entire than gonadectomized lambs, with some evidence of a greater depression in growth associated with castration than spaying. Effects on carcass weight followed those on live weight; weights for entire rams, wethers, entire and spayed ewes were 16.92, 14.72, 14.02 and 12.46 kg. respectively at approximately 7 months of age.

Growth and body composition of Omani local sheep 2. Growth and distribution of musculature and skeleton

1994 ◽  
Vol 58 (3) ◽  
pp. 373-379 ◽  
Author(s):  
O. Mahgoub ◽  
G. A. Lodge
Keyword(s):  
Spinal Column ◽  
Live Weight ◽  
Neck Region ◽  
Axial Skeleton ◽  
Meat Production ◽  
Muscle Weight ◽  
Slaughter Weight ◽  
Ewe Lambs ◽  
Ram Lambs ◽  
Muscle Groups

AbstractDistribution of tissue weight in the musculature and skeleton was studied in ram, wether and ewe Omani sheep raised under an intensive management system and slaughtered over the range 18 to 38 kg live weight. Ram lambs had higher muscle weight in the forequarters than wether and ewe lambs whereas the latter ‘sexes’ had heavier hindquarters and slightly more muscle in the muscle groups of proximal hind- and forelimbs and those surrounding the spinal column. Some of the neck region muscles, e.g. m. splenius and m. longissimus capitis et atlantis, were more developed in ram than in wether and ewe lambs. The proportions in the side muscle weight of some muscles (mainly in the hindquarter) decreased with increased slaughter weight whereas others (mainly in forequarter) increased, with the majority of the muscles showing no significant slaughter weight effects. The magnitude of change in proportions of individual muscles with increased slaughter weight was small and unlikely to have a commercial impact on meat production from Omani sheep.As a proportion of total carcass bone, the axial skeleton and the hindlimb decreased with increased slaughter weight whereas the forelimb did not show a significant change. Ram lambs had heavier individual bones than wether and ewe lambs and higher proportions of the axial skeleton and lower proportions of the hindlimb than wethers at 28 kg live weight. There were few differences between the various ‘sexes’ in length, width or circumference of bones. Except for the 12th rib, individual bones, in all sexes, grew at a rate lower than empty body weight.It is suggested that future improvement of Omani sheep should take into consideration the high proportion of bone in the carcass of these animals as well as the relatively higher proportion of bone in the limbs than in the axial skeleton.

Inheritance and correlation of productive traits in wool-and-meat producing sheep of different genotypes

2020 ◽  
pp. 12-20
Author(s):  
B. Traisov ◽  
Yu. Yuldashbaev ◽  
N. Kulmakova ◽  
K. Esengaliev ◽  
D. Smagulov
Keyword(s):  
Raw Materials ◽  
Live Weight ◽  
Animal Husbandry ◽  
The West ◽  
Sheep Breeding ◽  
Genetic Potential ◽  
Coeffi Cients ◽  
Productive Traits ◽  
West Kazakhstan ◽  
Quality Of Products

The effectiveness and competitiveness of sheep breeding directly depends on increasing the productivity of animals and improving the quality of products obtained from them, and this has been achieving by targeted breeding using the genetic potential of sheep breeds. The solution to this problem can be implemented through the rational use of breed resources of domestic and imported sheep breeding. Sheep breeding in Kazakhstan is the oldest branch of animal husbandry, which plays a major role in providing the national economy with specifi c types of raw materials and food. Sheep produce the largest amount of various products: wool for diff erent purposes, mutton, fat raw materials, sheep’s milk, sheep skin-fur-leather raw materials, lamb pelts. The whole of Kazakhstan and the West Kazakhstan region are characterized by a wide variety of natural, climatic and economic factors that have a specifi c infl uence on the development of sheep breeding in certain regions. In the West Kazakhstan region breeding work is carried out in a herd of Akzhaik wool-and-meat producing sheep to improve individual productive indicators by using the genetic potential of the gene pool of diff erent semifi ne-wool breeds, so breeding and improvement in order to increase the productivity of Akzhaik meat-wool sheep with double productivity is relevant and has great economic signifi cance. The inheritance and correlation of productive traits in Akzhaik wool-and-meat producing sheep obtained from diff erent mating options have been studied in the paper. It has been established that the inheritance of the main economically useful traits is additive in nature in an intermediate type with minor deviations towards one of the parent forms. The coeffi cients of heritability of live weight, clip, length and fi ber fi neness of wool are within the average values. The highest correlation coeffi cients (0,65–0,70) have been found in all groups between the length and fi ber fi neness of wool.

scholarly journals 196 Performance of landrace hair sheep lambs in a forage-based, semi-continuous production system

2019 ◽  
Vol 97 (Supplement_1) ◽  
pp. 77-78
Author(s):  
Stephan Wildeus ◽  
Dahlia O’Brien
Keyword(s):  
Continuous Production ◽  
Perennial Grasses ◽  
Single Group ◽  
Cool Season ◽  
Hair Sheep ◽  
Ewe Lambs ◽  
Soy Hull ◽  
Grazing System ◽  
Production Stages ◽  
Ram Lambs

Abstract Developing a system of year-round lamb production can address issues of continuous supply and product uniformity. In this project, Barbados Blackbelly (BB) and St. Croix (STX) Landrace hair sheep were used to produce cohorts of lambs in 4 mo intervals. Lambs were born on pasture, weaned at approximately 9 weeks, and returned to pasture after a period of post-weaning transition in pens. Ram lambs were rendered short-scrotum at weaning and grazed with ewe lambs as a single group in a rotational grazing system using cool season perennial grasses, warm and cool season annual forages, hay, and soy hull supplementation based on season and forage availability. Lambs were removed as they reached 35–40 kg or 12 mo of age. Data from two lamb cohorts born in April (n = 45) and August (n = 39), respectively, were analyzed for the effect of breed and sex on BW and ADG at different production stages. Birth weights of the April and August cohorts were similar (3.36 kg), but pre-weaning ADG and weaning weights were higher (P < 0.001) in the April (400 g/d and 15.6 kg) than August cohort (304 g/d and 12.1 kg). In contrast, pasture ADG (to 9 mo of age) was higher (P < 0.001) in the August (114 g/d) than April (73 g/d) cohort. Pasture ADG was higher (P < 0.05) in STX (100 g/d) than BB (88 g/d), and higher males (106 g/d) than females (81 g/d). During joint grazing of the two cohorts (December through March) ADG was initially higher (P < 0.001) in the older April (76 g/d) than August (16 g/d) lambs, but similar as they transitioned to annual forage (310 g/d). Pasture ADG fluctuated greatly in relation to forage quality, and to a lesser degree with breed and sex, and 79% of April and 84% of August cohort lambs reached target weights as yearlings.

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