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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Restrição alimentar em cordeiros terminados em confinamento / Food restriction in finished feedlot lambs

Cavilhão, Cristiani 13 September 2013 (has links)
Made available in DSpace on 2017-07-10T17:47:55Z (GMT). No. of bitstreams: 1 Cristiani_Cavilhao.pdf: 435376 bytes, checksum: d7bdf3578b70b41b4f8a307fbfe5b476 (MD5) Previous issue date: 2013-09-13 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / It was aimed with this study to evaluate the different levels effect of feed restriction on performance, intake, digestibility and feeding behavior of feedlot finished lambs, besides the economic viability of this feed management type . For this, 24 Santa Inês male lambs were used, to 20.00 ± 0.32 kg body weight distributed in an entirely randomized design in four different treatments. The experiment was divided into periods of 64 days each, in the first called restriction, the animals were assigned to treatments: no restriction (ad libtum intake with 10% leftovers), restriction of 20, 40 and 60 % in relation to intake of the control treatment. In the second period, called refeeding period, the diet was offered ad libitum to all animals in the experiment. Data were subjected to the variance analysis F test and when significant differences were detected, the regression analysis was used to study the food restriction levels. All statistical procedures were evaluated at 5 % probability. Feed restriction affected negatively the animals performance in all periods . There was a linear decrease in the intake of dry matter and nutrients throughout the experiment . No effects of dietary restriction on eating behavior were identified, except for time spent with feeding that was significantly reduced . The apparent digestibility of dry matter and nutrients did not differ statistically , except in the fiber digestibility in neutral detergent that linearly increased in the restrictive period with the imposed restriction levels . The food restriction management is economically viable in feedlot lambs production for 128 days / Objetivou-se com este trabalho avaliar o efeito de diferentes níveis de restrição alimentar sobre o desempenho, consumo, digestibilidade e comportamento ingestivo de cordeiros terminados em confinamento, além da viabilidade econômica deste tipo de manejo alimentar. Para tanto, foram utilizados 24 cordeiros machos Santa Inês, aos 20,00 ± 0,32 kg de peso corporal, distribuídos em delineamento inteiramente casualizado em quatro tratamentos distintos. O experimento foi dividido em 2 períodos de 64 dias cada, no primeiro chamado de restrição, os animais foram distribuídos nos tratamentos: sem restrição (consumo ad libtum com 10% de sobras), restrição de 20, 40 e 60% em relação ao consumo do tratamento controle. No segundo período, chamado de período de realimentação, a dieta foi ofertada ad libitum á todos os animais do experimento. Os dados foram submetidos ao teste F de análise de variância e quando detectadas diferenças significativas, a análise de regressão foi utilizada para estudo dos níveis de restrição alimentar. Todos os procedimentos estatísticos foram avaliados a 5% de probabilidade. A restrição alimentar afetou de maneira negativa o desempenho dos animais em todos os períodos avaliados. Houve redução linear no consumo de matéria seca e de nutrientes durante todo o experimento. Não foram identificados efeitos da restrição alimentar sobre o comportamento ingestivo, exceto no tempo despendido com alimentação que reduziu de forma significativa. A digestibilidade aparente da matéria seca e nutrientes não diferiu estatisticamente, senão na digestibilidade da fibra em detergente neutro que aumentou linearmente no período restritivo com os níveis de restrição imposta. O manejo de restrição alimentar é economicamente viável na produção de cordeiros confinados por 128 dias
22

Der Einfluss der Fütterungsintensität auf das Wachstum von Ziegenlämmern

Müller, Anke 27 June 2006 (has links)
Der Einfluss der Fütterungsintensität auf das Wachstum von Ziegenlämmern. Ziel der vorliegenden Arbeit ist es, die Auswirkungen einer Milchrestriktion während der laktogenen Aufzucht von Ziegenlämmern sowie Mechanismen des kompensatorischen Wachstums nach dem Absetzen der Tiere zu untersuchen. Im Literaturteil werden das kompensatorische Wachstum, die Einflussfaktoren welche die Kompensationseffekte bestimmen, mögliche Ursachen sowie die Auswirkungen auf das Tier beschrieben. Der eigenen Untersuchung liegen die Daten aus zwei Fütterungsversuchen mit insgesamt 58 Ziegenlämmern der Rasse Bunte Deutsche Edelziege im Alter von 7 bis 165 Tagen zu Grunde. In einem 2 x 2 faktoriellen Versuchsansatz wurden zunächst die Auswirkung einer Milchrestriktion um 40 % und eine anschließende zeitweilige Futterrestriktion um 40 % auf die Lebendmasse-entwicklung, die Futteraufnahme, Futteraufwand die Entwicklung der Inneren Organe sowie die Körperzusammensetzung der Lämmer untersucht. Die Ergebnisse sind im Hinblick auf mögliche Ursachen der Kompensationseffekte diskutiert. / The influence of different feed levels on the growth performance of goat lambs. This study investigated the effect of a milk restriction of preweaned lambs as well as the effects of compensatory growth after weaning. The literature part gives a overview of factors, which effect compensatory growth rates as well as reasons for the compensation of a waight deficite. The present study was carried out in 2 feeding experiments with 58 goat lambs (Bunte deutsche Edelziege) during the age of 7 to 165 days. The experiment investigated the influence of a restriction of milk (40 %) on prewaened lambs. After weaning the effect of a food restriction (40 %) on growth performance, food intake, food converting rate, development of internal organs and body composition of goat lambs was investigated. The results and possible reasons for the compensation effect are discussed.

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