Age-related variability of the woollen coat of Romanivska sheep breed

Pokhyl, V. I.; Mykolaychuk, L. P.

doi:10.32819/2019.71031

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…Вівчарство в Україні історично завжди було невід'ємною частиною національного господарства, що забезпечує його потреби у специфічних видах сировини і продуктах харчування. Ця галузь являє собою джерело таких видів продукції як вовна, баранина, молоко, смушки, хутряні, шубні та шкіряні овчини, а також ланоліну та кишок для парфумерної і фармакологічної промисловості (Pokhyl & Mykolaychuk, 2019). Але головною проблемою вівчарства залишається висока собівартість виробництва продукції.…”

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Analysis of the influence of genetic and non-genetic factors on the birth weight and weaning weight of lambs

Крамаренко

Lugovoy

et al. 2020

SMLNUVMBA

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The main aim of this paper is to analyze the influence of genetic and non-genetic factors on the birth weight and weaning weight of lambs. The study was carried out on the basis of the Institute of Animal Husbandry of Steppe Regions named by M. F. Ivanov “Askania-Nova” – the National Scientific Agricultural Center in Sheep Breeding of NAAS. Birth and weaning weights data collected during a 5-vear period from 3961 lambs were used. The reproductive traits of the Ascanian fine-fleece (AC) ewes were evaluated in combination with the rams of different genotypes: Ascanian fine-fleece, Australian merino (AM) and half-bred animals (1/2AC+1/2AM). The main effect of the ram genotype and the year of lambing, the age of the ewes, the litter size, the sex of lamb and the sex ratio in twins on the birth weight and weaning weight of lambs was analysed using one-way ANOVA. Differences between years of the 5-year period were highly significantly (P < 0.001) for all lamb traits studied. The effects of the environmental factor (year of lambing) on the birth weight and weaning weight of lambs represented 27.2 and 15.2 per cent of the total variance, respectively. The ram-group effects, which are mainly genetic differences, were highly significant (P < 0.001) in all traits. Age of dam had significant effect on the birth weight of lambs (P = 0.048) and was relatively unimportant as a source of variation. Two-year-old ewes bore lighter lambs than older ewes. There were no significant differences in the weaning weight of lambs from the ewes of different age classes. Survival rate was related to birth weight of lambs. Lamb survival increased up to a birth weight of 4.0 kg and only declined when they weighed more than 5.0 kg at birth. Our results showed that singles were 0.61 kg heavier than twins at birth and were 2.42 kg heavier than twins at weaning. Litter size (type of birth) was responsible for 42.5 and 10.0 % of total variability in birth and weaning weights of lambs, respectively (in both cases: P < 0.001). Average birth and weaning weights of male lambs were higher than the females (in both cases: P < 0.001).

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Section: вступunclassified

Analysis of the influence of genetic and non-genetic factors on the birth weight and weaning weight of lambs

Крамаренко

Lugovoy

et al. 2020

SMLNUVMBA

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“…Одна з найбільш складних проблем, яку необхідно вирішувати агропромисловому комплексу України для формування продовольчої безпеки країни -це збільшення виробництва м'яса, зокрема, яловичини, свинини, курятини, баранини, поліпшення їх якості та зниження собівартості (Pokhyl & Mykolaychuk, 2019).…”

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Features of sheepskin productivity of different origin sheep

Pokhyl¹,

Mykolajchuk²,

Izhboldina³

2020

TAVM

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Sheepskin is a component of two important elements -leather fabric and wool. At all stages -from skinning to the production of semi-finished products, the main task is to preserve the sheepskin's natural qualities and the bond strength of wool with leather fabric. The aim of the research was to study the qualitative indicators of Romanov sheep's and crossbreed's sheepskin obtained by crossing Romanov sheep ewes with rams of Gissar breed. The effectiveness of crossbreeding in terms of sheepskin performance and its physical and technical properties was established. By the mass of sheepskin raw materials, crossbreed lambs were dominated over Romanov purebred peers by 10.9%. These differences were associated with different live weights of experimental young sheep. By the area of sheepskins, crossbreed young growth exceeded purebred peers by 9.8%. These sheepskins have a coarser coat and were characterized by the powerful development of the dermis pilar and reticular layers, which is associated with the breed characteristics of these structures. The dermis thickness in experimental sheep was in the range of 1.1-1.3 mm. Sheepskin of the Romanov breed sheep, due to its preserving and further processing, were reduced by 21.3%, which was 2.9% more compared to the experimental group. This feature is associated with the histological structure of dermal structures in experimental young animals. An indicator that characterizes the relative lightweight of the produced sheepskin is the mass of the semi-finished product (dm 2 ). According to these data, crossbreed young sheep were dominated over purebred peers by 25.6%, and it indicated their compliance with standards, according to current requirements in the fur industry. And according to the physical and technical properties, crossbreed sheepskin was dominated over pure-bred young sheep's in terms of raw materials and semi-finished products, and in terms of wool yield-to-launch ratio, by 2.6%. However, studies indicated that the sheepskin of experimental genotypes met the requirements for raw materials of existing processing industry standards.

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“…Sheep breeding in Ukraine historically has always been an integral part of the national economy, which meets its needs for specific types of raw materials and food [14]. But the high cost of production remains the main problem of sheep breeding.…”

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The effects of breed, sire and environmental factors on the birth and weaning weight of lambs

Крамаренко¹,

Крамаренко²,

Lugovoy³

et al. 2020

UBSRAS

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The effects of breed, sire and environmental factors on the birth and weaning weight of lambs The aim of this study was to determine the effect of some important factors influencing on the birth and weaning weight variability in lambs. Data from 2603 ewes was included in the analysis, where 3961 lambs were obtained during the five years of the research. Data was tested using analysis of variance (ANOVA) with the GLM procedure of Minitab Release 13.1. Our results presented significant influence on the year of lambing, breed, ram genotype, age of a dam, type of a birth (litter size), sex of a lamb and on the birth weight and weaning weight of lambs. Keywords: birth and weaning weight of lambs; ram genotype; year of lambing; age of ewes; litter size (type of birth); sex of a lamb; the Ascanian fine-fleece breed.

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Age-related variability of the woollen coat of Romanivska sheep breed

Cited by 4 publications

References 9 publications

Analysis of the influence of genetic and non-genetic factors on the birth weight and weaning weight of lambs

Analysis of the influence of genetic and non-genetic factors on the birth weight and weaning weight of lambs

Features of sheepskin productivity of different origin sheep

The effects of breed, sire and environmental factors on the birth and weaning weight of lambs

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