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Journal of Animal Science and Technology
(JAST)영문학술지
Vol. 56, 57(2014~)
[한국동물자원과학회]
▣ 편집위원장 : 최인호
▣ 편집위원 : 정호영, 최창원, 이철영, 오세종, 김관석,
    이홍구, 송민호, 김은중, 조철훈

논문번호 :
1409
학회지년월 : 201805
접수일자 : 2017-12-22 채택일자 : 2018-05-14
전공분야 : 단위가축영양
조 회 수 : 0
Intake and performance of lambs finished
in feedlot with wet brewer’s grains

Mônica Feksa Frasson1* , Sérgio Carvalho1, Gustavo Jaurena2, Aliei Maria Menegon1, Marcelo Machado Severo1,
Juliano Henriques da Motta1 and William Soares Teixeira1

Background: The use of agroindustrial by-products in ruminant nutrition to be an interesting alternative in order to
reduce production costs and environmental impacts arising from the inadequate destination of residues. The initial
step of beer production yields a large volume of wet brewer’s grains all year around, which is available at a low
cost and has a high nutritional quality, and hence a big potential for animal production.
Methods: Twenty-four Suffolk non-castrated male lambs, from simple parturition were kept in individual spots and
allocated to four treatments constituted by four levels of substitution of sorghum silage by WBG (i.e.0; 33.5; 66.5
and 100% of substitution). It was used roughage: concentrate rate of 50:50, based on dry matter.
Results: The ether extract intake increased while the acid detergent fiber intake decreased linearly (P ≤ 0.05).
Substituion of sorghum silage by WBG did not change lambs’ feed DMI, daily weight gain and feed conversion.
Conclusion: The substitution of sorghum silage by WBG as roughage showed to be a viable alternative from the
productive and economic point of view for finishing of feedlot lambs.
Keywords: Feed conversion, Ovines, Weight gain
논문번호 :
1411
학회지년월 : 201805
접수일자 : 2017-07-25 채택일자 : 2018-05-21
전공분야 : 번식생리및내분비
조 회 수 : 0
Maximum number of total born piglets in a
parity and individual ranges in litter size
expressed as specific characteristics of sows

Gertraude Freyer

Background: The objective of this study was to underline that litter size as a key trait of sows needs new parameters
to be evaluated and to target an individual optimum. Large individual variation in litter size affects both production
and piglet’s survival and health negatively. Therefore, two new traits were suggested and analyzed. Two data sets on
5509 purebred German Landrace sows and 3926 Large White and crossing sows including at least two parental
generations and at least five parities were subjected to variance components analysis.
Results: The new traits for evaluating litter size were derived from the individual numbers of total born piglets (TBP)
per parity: In most cases, sows reach their maximum litter size in their fourth parity. Therefore, data from at least five
parities were included. The first observable maximum and minimum of TBP, and the individual variation expressed by
the range were targeted. Maximum of TBP being an observable trait in pig breeding and management yielded clearly
higher heritability estimates (h2~ 0.3) than those estimates predominantly reported so far. Maximum TBP gets closer to
the genetic capacity for litter size than other litter traits. Minimum of TBP is positively correlated with the range of TBP
(rp = 0.48, rg > 0.6). The correlation between maximum of TBP and its individually reached frequency was negative in
both data sets (rp = − 0.28 and − 0.22, respectively). Estimated heritability coefficients for the range of TBP comprised a
span of h2 = 0.06 to 0.10.
Conclusion: An optimum both for maximum and range of total born piglets in selecting sows is a way contributing to
homogenous litters in order to improving the animal-related conditions both for piglets’ welfare and economic
management in pig.
Keywords: Pig, Litter size, Individual maximum, Variation, Heritability, Trait correlation
논문번호 :
1410
학회지년월 : 201805
접수일자 : 2017-09-21 채택일자 : 2018-05-21
전공분야 : 번식생리및내분비
조 회 수 : 0
Flock composition, breeding strategies and
farmers’ traits of interest evaluation of
Wollo highland sheep and their F1 crosses

Tadesse Amare1,2* , Gebeyehu Goshu2 and Berhan Tamir2

Background: Sheep production is a major component of the livestock sector in Ethiopia. The country owing to the large
population of 30.70 million estimated numbers of sheep in the country and out of which about 72.14% are females, and
27.86% are males with diverse genetic resources. The real value of indigenous breeds was often under-estimated mostly
due to their poor appearance and relatively low productivity. Developing countries in most cases opt for exotic breeds to
increase animal productivity through crossbreeding or breed substitution without properly investigating the production
potential of the indigenous breeds. The main objective of the research was to identify sheep flock composition and
structure, farmers’ traits of interest and breeding objective of Wollo highland sheep, and their F1 crossbreed progenies.
Results: Smallholder farmers’ flock synthesized from breeding ewes, breeding rams, pre-weaned ewe lambs, pre-weaned
ram lambs, unproductive ewes, castrated and fattened rams, with the percentage coverage of 29.2, 13.3, 15.5, 16.5, 12.4,
and 12.5%, respectively. The maximum number of flock size was 289.0 sheep per flock and higher in the third stratum.
The off-take rate percentage of the three strata presented as 21.9% in 1st stratum, 12% in the 2nd stratum, and 16.4% in
the 3rd stratum and higher off-take rate recorded in the first stratum. Sheep producer’s traits of interest ranked by growth
rate (first), body size (second) and marketing value was third rank. Communal breeding (random mating), village based
controlled breeding, mixed type and private ram controlled breeding practice were comprised of 39.7, 61.7, 52 and 71.3%,
respectively. The percentages of ewes per flock composition were presented as 36.5, 27.1 and 25.5%, respectively in the
3rd stratum, 2nd stratum and 3rd stratum in the order of their importance’s.
Conclusion: Genetic improvement practices at smallholder sheep producers situation was showing promising outcome
with indigenous Washera F1 crossbred lambs and which designated for weaning rate, body size, marketing age, age at
first lambing, good temperament and large litter size in the order of their rank. The contemporary breeding practice
tendency indicated that, reduced flock size to improve flock productivity via crossbreeding practices.
Keywords: Flock, Breeding objective, Traits of interest, Crossbreed progenies, Wollo highland breed
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