Browsing by Subject "Sheep -- Feeding and feeds"
Now showing 1 - 8 of 8
Results Per Page
Sort Options
Item Effect of methods of processing upon digestibility of a new wheat by sheep and cattle(Texas Tech University, 1970-12) Cornett, Clifford DanNot availableItem Effects of range management practices on wool production(Texas Tech University, 1984-08) Carey, James AddisonNot availableItem Ergot infested sorghum for swine and sorghum silage for sheep(Texas Tech University, 2000-08) Abdelrahim, Gamalelden MSorghum is the fifth most important cereal grain in the world after wheat, rice, maize, and barley. Incidence of molds and mycotoxins in commercial animal feed mills, if it exists, is a very serious problem. The first study was conducted to investigate the impact of three levels of sorghum infected with ergot alkaloids on the reproductive performance of swine. Eighteen sows were placed on one of three treatments containing 0 ppm, 12 ppm and 24 ppm ergot alkaloids. With the exception of the control treatment, the same sows were used during the first and second parities. There were six sows per treatment group. Results indicated that combined gain of 28 d old nursing pigs was higher (P < 0.05) for the 24 ppm ergot alkaloids treatment than for 12 ppm. During the first parity, interval to estrus was less (P < 0.05) for the 24 ppm ergot alkaloids treatments than for 12 ppm. Variables that were affected by the level of ergot alkaloids during the second parity were weight of live pigs bom and lactation feed intake. The number of live pigs bom was higher {P < 0.05) for 24 ppm and 12 ppm than for 0 ppm ergot alkaloids. Additionally, lactation feed intake was higher (P < 0.05) for 0 ppm than for 12 ppm. Gain at day 28 was the only variable affected by the treatments, when results were combined for parity one and parity two. Gain at day-28 was higher {P < 0.05) for 0 ppm and 24 ppm ergot alkaloids than for 12 ppm. Overall, variables that were affected by the infestation of grain sorghum by the ergot alkaloids were pig gain to day-28; lactation feed intake and interval to next estrus. The second project investigated the performance of 24 wether lambs fed corn, brown midrib-100, fame and Cow Vittles II silages. Silage is a palatable high-yielding source of nutrients for ruminants. In this study, silages supplemented were either cottonseed meal, coated cottonseed or uncoated cottonseed. Sorghum silages compared to com silage increased (P < 0.01) intakes of magnesium, copper, zinc, iron and manganese. Intakes of dry matter, nitrogen, magnesium, phosphorus, calcium, copper, potassium, sulfur, manganese and iron were higher (P < 0.01) for brown midrib- 100 than for the mean of fame and Cow Vittles II. Additionally, intakes of copper, manganese and iron were higher (P < 0.01) for fame than for Cow Vittles.Item Feeding value of chemically treated mesquite and cotton linters for ruminants(Texas Tech University, 1980-05) McCarthy, Dennis BrynieNot availableItem Forage intake, diet composition and bioenergetics of grazing sheep in southern Peru(Texas Tech University, 1985-08) Fierro-Garcia, Luis CarlosNot availableItem Nutritional quality of mesquite (Prosopis glandulosa) and potential toxicosis in sheep(Texas Tech University, 1996-08) Baptista, ReneMesquite leaves are emergency forage during dry seasons but they have low palatability. An in vivo digestion trial was completed with lambs (n = 15) assigned to diets of 0, 5, 10, 15, or 20% mesquite leaves mixed with alfalfa hay to measure effects of mesquite on digestion parameters. Proportion of mesquite leaves in the diet negatively affected dry matter (DM) intake, nitrogen (N) balance, gross energy (GE) intake, retained N, retained GE, and weight gain at levels > 5% of the diet (P < 0.01). Mesquite intake was the highest at the 5% level (1.81 g/kg BW; P < 0.01) and averaged 0.78 g/kg BW for the remaining diets. Coefficient of apparent digestibility (COD) was not affected by level of mesquite in the diet (P = 0.58). An in situ Dacron bag trial revealed that pure alfalfa hay was more digestible than mesquite leaves (P = 0.01). However, %N, acid and neutral detergent fiber (ADF and NDF) did not differ between mesquite and alfalfa. Low levels of enzymes bilirubin, aspartate aminotransferase, and gammaglutamyl transferase suggested no liver damage (P > 0.05). Allelochemicals in mesquite were presumably strong intake inhibitors. A conditioned flavor aversion (CFA) trial tested the effect of postingestive feedback from mesquite on the intake of a novel feed (rye). On day 1, lambs were offered rye and then ground mesquite was infused into their rumens by tube. Lambs (n=21) were assigned to dosing treatments 0 (control), 3.0 (low), and 4.5 (high) g/kg BW of mesquite leaves. On day 3, lambs dosed with mesquite ate less than controls (P < 0.01) showing a strong CFA. Aversion to rye persisted for at least 2 days (P < 0.01). The high dose of mesquite decreased the intake of alfalfa ration for at least 3 days (P <0.01). Persistent diahrrea in lambs receiving the high mesquite dose could be a result of toxins in mesquite. Examination of nutrients in mesquite leaves collected from May to November 1995, showed an increasing trend for DM from 42% (May) to 58% (November). Content of N decreased with season (P < 0.01), from a maximum of 2.73% in May to 1.58% in November. Analysis of ADF and NDF indicated similar effect of months (P <0.01). Minimum content of fiber was found in May, (23.7% ADF; 32.0% NDF) and maximum levels were reached in June (32.9% ADF; 43.1% NDF). Values of fiber decreased again in November (29% ADF; 38.8% NDF). In vitro digestibility was similar for May and June (79%), and decreased significantly (P <0.01) for the remaining months, from 74% in July to 69% in November.Item Ruminal inoculation in lambs fed all-concentrate rations with and without urea(Texas Tech University, 1967-06) Wristen, Perry RossNot availableItem The effects of bermudagrass-clipping pellets as an alternative forage source in the diets of sheep(Texas Tech University, 2004-12) McMillan, Matthew LeeThree studies were conducted to determine the effects of Bermuda grass-clippings (Cynodon dactylon L.) collected from domestic lawns as an alternative forage source in the diets of sheep. The first study compared Bermuda grass-clipping pellets (Cynodon dactylon L.) to alfalfa pellets (Medicago sativa L.) in a concentrate diet fed to 60 Suffolk, Rambouillet x Suffolk, and hair crossbred lambs. Feed efficiency data and carcass characteristics were recorded to determine treatment differences. No differences (P > .05) were found between the two diets for any feed efficiency or carcass characteristics when using pen as the experimental unit. However, breed effects were significant (P < .05) for initial weight, days on feed, average daily gain, dry matter intake, daily dry matter intake, feed:gain, fat thickness, flank streakings, and quality grade. In the second study, a metabolism trial was performed to determine apparent crude protein (CP) retention and absorption of three concentrate diets containing either alfalfa pellets (Medicago sativa L.), Coastal Bermuda grass hay pellets (Cynodon dactylon L.), or bermuda grass-clipping pellets (Cynodon dactylon L.). Twenty-one Rambouillet wethers were used in the study. A 5 day (d) warm-up period was followed by a 7 d total collection period of all urine and fecal material produced. No differences (P > .05) were found for N intake, dry matter digestibility (DMD), fecal N, urinary N, apparent N absorbed, or apparent N retained. In the third study, rumen fluid was collected from a canulated steer on a 100% Bermuda grass hay (Cynodon dactylon L.) diet to perform an in vitro dry matter disappearance analysis on alfalfa pellets (Medicago sativa L.), Coastal bermuda grass hay pellets (Cynodon dactylon L.), and bermud agrass-clipping pellets (Cynodon dactylon L.). Digestibility was measured over a 12, 24, and 48 hour time period. Digestibility significantly increased (P < .05) over time for alfalfa (Medicago sativa L.) and Coastal bermudagrass pellets (Cynodon dactylon L.), but not for bermuda grass-clippings (Cynodon dactylon L.). When comparing digestibility between forage sources, alfalfa (Medicago sativa L.) was the highest (P < .05) in digestibility over all three time periods. Bermuda grass-clippings (Cynodon dactylon L.) were the second highest (P < .05) in digestibility for the 12 hour and 24 hour time period. However, Bermuda grass clippings (Cynodon dactylon L.) and Coastal bermuda grass hay (Cynodon dactylon L.) were not different (P > .05) in digestibility for the 48 hour time period.