Thesis (M.Sc. (Agriculture)) --University of Limpopo, 2010 / Two studies were carried out to investigate the effect of cowpea cultivar supplementation on productivity of Pedi goats and Doper sheep fed ad libitum buffalo grass. Experiment 1 investigated the effect of cowpea cultivars supplementation on productivity of Pedi goats fed ad libitum buffalo grass hay using twelve goats that were assigned in a completely randomized design. The Pedi goats were fed ad libitum a basal diet of buffalo grass supplemented with four levels each of four cowpea cultivars namely, Pan 311, Red caloona, Black eye and Agripes. The four levels fed were 50, 100, 150 and 200 g/day. The experiment involved a 25 day preliminary period and a five day collection period during which feed intake, digestibility, live weight changes and nitrogen were measured. Based on available data, all the cowpea cultivars contained more than 15 % crude protein and can therefore be used as protein supplements to goats on low quality roughage. Pan 311 had higher feeding value (p<0.05), although it contained the highest concentration of condensed tannins. The concentration of tannins in Pan 311 did not exert negative effects on intake and digestibility. The data on a in vitro enzymatic digestibility of the cowpea cultivars and buffalo grass hay demonstrated that the cowpea cultivars had higher in vitro DM, OM and protein digestibilities that ranged from 0.64 to 0.75. The cowpea cultivars have high in vitro digestibility values thus implicating their suitability as supplements. Also chemical contents of the cowpea cultivars and the buffalo grass hay had poor capacity to predict forage in vitro digestibility. Forage intake and growth rate of Pedi goats were poorly predicted from in vitro digestibility. Experiment 11 investigated the intake and relative palatability indices of four cowpea cultivars offered to Pedi goats and Dorper sheep fed low quality buffalo grass hay. The experiment was a 2 (animal species goats and sheep) x 5 diets (four cowpea cultivars and buffalo grass hay) factorial arrangement in a completely randomized design. Intake and palatability of the goats and sheep were higher in Pan 311. Sheep had higher voluntary feed intake values than goats, but palatability indices were higher in goats than in sheep. Goats were better than sheep in the palatability indices ranking of the four cowpea cultivars. This seems to demonstrate that goats are better suited for assessing palatability indices ranking of cowpea hays and other similar legumes. Forage intakes and palatability indices ranking were poorly predicted from their nutrient. Growth of the goats was well predicted by forage in vivo digestibility and palatability indices. Also, forage intakes accurately predicted the palatability indices of the cowpea cultivars by the goats and sheep.

Le grenadier (Punica granatum) est adapté aux climats arides et semi-arides d'où l'intérêt d'étudier et valoriser ses fruits à cause de l'accentuation des problèmes de sécheresse qui touchent le Maroc ces dernières années. D'un autre côté, la grenade possède de fortes capacités antioxydantes et anti-inflammatoires liées à la présence d'anthocyanes, de tanins et d'acide ellagique qui est utilisé en thérapeutique pour sa capacité à inhiber la prolifération des cellules cancéreuses. Toutefois, le but de ce présent travail s'intéresse dans un premier temps à la caractérisation physicochimique, l'identification et quantification des polyphénols des jus en utilisant l'HPLC ainsi que l'évaluation de l'activité antioxydante de dix-huit cultivars collectionnés au niveau de l'INRA de Meknès. Cette étude a permis de conclure que les jus ont une forte teneur en polyphénols totaux qui varie entre 1385 to 9476 mg GAE/L. L'étude a montré aussi une variabilité statistiquement significative entre les différents cultivars étudiés pour l'ensemble des paramètres mesurés. Dans la seconde partie, qui traite l'effet de la température sur la stabilité des polyphénols et surtout des anthocyanes, il a été montré que la composition de ces composés diminue après chaque traitement thermique suite à leurs dégradations. Pour la troisième partie concernant l'étude de l'efficacité des pectinases et des protéases dans les traitements de clarification du jus de grenade. Le traitement par les pectinases à une réduction significative de la turbidité par rapport à la protéase. La combinaison de ces deux enzymes donne un bon résultat en terme de réduction de la turbidité. Dans la dernière partie consacrée à la modélisation de la croissance microbienne qui consiste à appliquer les modèles mathématiques fournis par la base de données ComBase sur le jus de grenade, les résultats obtenus ont montré que à des valeurs minimales de la température, pH et l'activité de l'eau assurent une longue durée de vie pouvant aller jusqu'à un mois et que le modèle ComBase est sécurisant en général pour ce type de jus.

Made available in DSpace on 2014-08-20T13:44:46Z (GMT). No. of bitstreams: 1 dissertacao_rogerio_seus.pdf: 873462 bytes, checksum: 7ffb64cdf1ad898ac120efaf441fcb4f (MD5) Previous issue date: 2011-02-17 / The soybean crop has an important economic partner in the country, because Brazil is a major producer of the grain in the world. Rio Grande do Sul is a state with a grain production characteristic, among them rice and soybeans, with approximately six million hectares of paddy soils, where only one fourth is occupied by rice cultivation, and the rest remain fallow and underutilized. However, we have sought alternatives to the cultivation of these areas, with crops that support the environmental conditions, making it the most profitable areas. The objective of this study was to evaluate the performance of three soybean cultivars, as well as the physiological quality in planossolo seed produced, submitted to five plant populations. The experiment was conducted at Embrapa Clima Temperado in 2008/09 and 2009/10 crop, using five populations (16, 28, 40, 52 and 64 plants per m²) and three cultivars (BRS PampaRR, BRS BRS 246RR and BRS 255RR) arranged in blocks with three and four replications in their respective crop. Significant responses for most variables when subjected to population changes, decreasing the value of these when they population increased. Moreover, with increasing population, variables such as number of nodes, pod and seeds per unit area had increased in value in the branches, while the main stem remained almost flat. This demonstrates first that the effect of number of branches directly influences yield components, and second, the ability to adjust components before different populations. Variables such as seeds per pod and thousand seed weight did not change or contributed little in yield, and the response varies with the population. There was a positive relationship in the yield on the main stem population growth, has branches in the relationship was negative, ranging in 2009/10 crop among cultivars. Overall, the yield in the 2008/09 crop did not change significantly, while in 2009/10 crop there was significant increase in yield with population increase. For the cultivars, most of the variables there was significant response to the 2008/09 crop on the main stem and to the 2009/10 crop on branches, especially in BRS PampaRR and BRS 246RR cultivars, on the other hand the BRS 255RR cultivar stands in the variable thousand seeds weight. The components of yield are directly related to the branches and thus reflected in yield. However, the partial yield (main stem and branches) was not significant difference among cultivars. Thus we can conclude that the environment influences in the yield, as population and cultivars, the component that contributes most in yield is the number of pods, and the components behave differently on the main stem and branches. / A cultura da soja possui um importante papel sócio econômico no país, pois o Brasil é um dos maiores produtores do grão no mundo. O Rio Grande do Sul é um estado com características de produção de grãos, dentre elas o arroz e a soja, possuindo aproximadamente seis milhões de hectares de solos de várzea, onde apenas um quarto é ocupado pelo cultivo do arroz, e o restante permanece em pousio e subutilizada. No entanto, tem-se buscado alternativas ao cultivo destas áreas, com culturas que suportem as condições do ambiente, tornando as áreas mais rentáveis. O objetivo deste trabalho foi avaliar o comportamento de três cultivares de soja, assim como a qualidade fisiológica de sementes produzidas em planossolo, submetida a cinco populações de plantas. O experimento foi desenvolvido na Embrapa Clima Temperado nas safras 2008/09 e 2009/10, utilizando-se cinco populações (16, 28, 40, 52 e 64 plantas por m2) e três cultivares (BRS PampaRR, BRS 246RR e BRS 255RR) dispostos em blocos ao acaso em três e quatro repetições, nas respectivas safras. Houve resposta significativa para a maioria das variáveis analisadas quando submetidas à variação na população, decrescendo o valor destes quando se aumentou a população. Por outro lado, com o aumento da população, variáveis como número de nós, legumes e sementes por unidade de área tiveram um acréscimo no valor nos ramos, enquanto na haste principal permaneceu decaindo. Isso mostra primeiramente que o efeito do número de ramos influencia diretamente os componentes do rendimento, e em segundo, a capacidade de ajuste dos componentes perante diferentes populações. Variáveis como sementes por legume e peso de mil sementes não variaram ou pouco contribuíram no rendimento, além de variarem a reposta com a população. Houve uma relação positiva no rendimento na haste principal com o aumento da população, já nos ramos a relação foi negativa, variando na safra 2009/10 entre as cultivares. No geral, o rendimento na safra 2008/09 não apresentou variação significativa enquanto na safra 2009/10 houve acréscimo significativo no rendimento com o aumento da população. Em relação as cultivares, na maioria das variáveis houve resposta significativa para a safra 2008/09 na haste principal e para a safra 2009/10 nos ramos, destacando-se as cultivares BRS PampaRR e BRS 246RR, por outro lado a cultivar BRS 255RR se destaca na variável peso de mil sementes. Os componentes do rendimento estão diretamente relacionados com os ramos e consequentemente refletindo no rendimento. No entanto, o rendimento parcial (haste principal e ramos) não obteve diferença significativa entre as cultivares. Assim pode-se concluir que o ambiente influencia no rendimento, assim como a população e as cultivares, o componente que mais contribui no rendimento é o número de legumes, e os componentes se comportam diferentemente na haste principal e nos ramos.