No description available.

no abstract provided by author / Master of Science

Typescript (photocopy). / Digitized by Kansas Correctional Industries

LD2668 .T4 1966 D44 / Master of Science

Thesis (Ph. D.)--University of Missouri-Columbia, 2000. / Typescript. Vita. Includes bibliographical references (leaves 156-168). Also available on the Internet.

Thesis (Ph. D.)--University of Missouri-Columbia, 2000. / Typescript. Vita. Includes bibliographical references (leaves 156-168). Also available on the Internet.

The aim of the present study was to investigate the bioavailability of selenium (Se) from milled soya beans, a plant protein, to lambs after various degrees of heat treatment. Thirty Dohne Merino lambs (ca. 25 kg live weight, 4 months old) were allocated randomly within sex and weight groups into three treatment groups. During the experimental period, they were fed a diet consisting of a large proportion of milled soya beans as their main source of Se and other feeds low in Se to balance the diet. Blood was drawn during this period and analysed for Se and glutathione peroxidase (GSH-Px) activity. Chemical and Se analyses were performed on the feed and soya bean samples as well as on the organs, wool and rumen fluid of the lambs. Although the ADIN concentration of the soya beans increased with increasing heat treatments, more heat damage could have been inflicted on it to differentiate the different soya bean fractions in comparison to each other. On average, the in sacco disappearance of the dry matter (DM), crude protein (CP) and Se was higher for the unprocessed soya beans compared to the two processed soya beans fractions. As a result, the lambs receiving the unprocessed soya beans (control group- C-group) had a significant higher rumen bacterial Se concentration than the lambs receiving the heat¬treated soya beans. Despite this higher concentration, the liver Se concentration of this group was statistically significantly lower compared to the two heat-treated groups. This can be interpreted that the heat processing of the soya beans enhanced its Se fraction to be taken up by the liver. However, those differences were biologically not significant. The average liver Se concentration between the lambs receiving the over- ¬processed- (a-group) and those receiving the ideal treated soya beans (I-group), did not differ, indicating that the excessive heat treatment did not influence the amount of Se reaching the lower digestive tract of the a-group. Although the Se concentration of the heart muscle of the a-group was statistically significantly lower than for the I-and C-groups, those differences biologically were not significant. Despite an increase in the erythrocyte GSH-Px activity over the duration of the trial in all three the treatment groups, no significant differences between the three treatment groups were observed at any stage. It is concluded from this study that the heat treatment of soya beans has not influenced the incorporation and the bioavailability of its Se fraction to any significant degree. / Dissertation (MSc (Agriculturae))--University of Pretoria, 2006. / Animal and Wildlife Sciences / unrestricted

Sixteen pregnant heifers (8 per group) were fed diets containing soybean meal or whole raw soybeans (WSB) to evaluate effects of the supplemental dietary fat provided by WSB during the last trimester of gestation (90 d) on performance in the first 5 wk of the subsequent lactation, during which both groups were fed the same diet. Despite similar DMI by both groups, heifers fed WSB had greater ether extract (EE) intake and tended to weigh more after calving. By 35 DIM, heifers previously fed WSB had greater milk yield with a tendency for greater milk fat yield, although DMI was similar for both groups. Blood obtained by jugular venipuncture four times per day during gestation (-90 d, -69 d, -48 d, and -27 d), on day of calving (0 d), and during lactation (+35 d) was used to evaluate glucose and NEFA response to diet. Glucose concentration in blood plasma at -69 d and 0 d was lower in heifers fed WSB; whereas, plasma NEFA concentration was greater at -69 d, -48 d, and +35 d, but lower at 0d. Basal concentrations of glucose and NEFA in plasma and their response to insulin challenge (.26 IU per kg BW) were similar for both dietary groups at -30 d and +35 d. Plasma NEFA concentrations in response to insulin challenge, however, were greater at -30 d than at +35 d. Basal plasma triacylglycerol concentration was greater at -30 d and lower +35 d, due to feeding WSB during gestation. In addition, plasma 16:0 and 18:1 (%, wt per wt) concentrations were lower and 18:2 higher at -30 d in heifers fed WSB. At 35 DIM, heifers previously fed WSB again had lower 16:0 and higher 18:2 in plasma. Dietary treatment during gestation had no influence on long chain fatty acid concentrations in adipose tissue. Supplemental dietary fat provided by WSB for 90 d prior to parturition apparently altered the supply and metabolism of lipids in a manner that improved milk production during early lactation. / Master of Science

No description available.

Graduation date: 1992