Ractopamine hydrochloride and the environmental sustainability of pork production
| dc.contributor.advisor | Beaulieu, Denise | en_US |
| dc.contributor.advisor | Patience, John F. | en_US |
| dc.contributor.committeeMember | Paterson, Phyllis G. | en_US |
| dc.contributor.committeeMember | Mutsvangwa, Tim | en_US |
| dc.contributor.committeeMember | Leterme, Pascal | en_US |
| dc.contributor.committeeMember | Drew, Murray D. | en_US |
| dc.creator | Ross, Kathryn Anne | en_US |
| dc.date.accessioned | 2009-03-24T18:00:55Z | en_US |
| dc.date.accessioned | 2013-01-04T04:27:12Z | |
| dc.date.available | 2010-03-25T08:00:00Z | en_US |
| dc.date.available | 2013-01-04T04:27:12Z | |
| dc.date.created | 2009 | en_US |
| dc.date.issued | 2009 | en_US |
| dc.date.submitted | 2009 | en_US |
| dc.description.abstract | These experiments were conducted to determine if ractopamine hydrochloride (RAC) could improve nutrient utilization and decrease water use in hog operations. The growth experiment utilized a comparative slaughter technique that consisted of 120 barrows (95 ± 3 kg BW) including 12 assigned to an initial slaughter group; the remaining pigs were slaughtered at 108- or 120-kg. Growth performance and nutrient retention were determined. The 15 d metabolism experiment consisted of 54 pigs (95 ± 3 kg BW). Growth performance, feed, and water intake and urine and fecal output were measured. The metabolism experiment used 9 dietary treatments arranged as a 3 x 3 factorial: 3 levels of RAC (0, 5 and 10 ppm) and 3 standardized ileal digestible lysine: digestible energy (DE) ratios (1.75, 2.25 and 2.75 g/Mcal DE). The growth study was designed as a 3 x 3 x 2 factorial to include slaughter weight as an additional factor. In the growth experiment, RAC had no effect ADG, ADFI, or G:F (P > 0.10). With increased Lys levels G:F improved (P < 0.05), but not ADG or ADFI (P > 0.10). Protein deposition rates numerically increased (P = 0.11), water deposition rates tended to increase (P < 0.10), whereas lipid deposition tended to decrease with RAC inclusion (P < 0.10). In the metabolism experiment, with greater levels of RAC and Lys the pigs had improved ADG (P < 0.05) and G:F (P < 0.001). Water intake (P < 0.05.) and urine output (P < 0.05) decreased with greater RAC inclusions. Lys inclusion did not alter water balance (P > 0.10). Urinary N excretion (P < 0.05), total N excretion (P < 0.05), and the urine N:fecal N ratio (P < 0.001) decreased with addition of dietary RAC; however fecal N (P < 0.05) increased with dietary RAC inclusion. Retention of N improved with addition of RAC to the diet (P < 0.05). With greater dietary Lys inclusion fecal N was reduced (P < 0.001). The pigs fed the 2.25 g/Mcal Lys tended to have the lowest urinary N and total N excretion and highest N retention (P < 0.10) and greatest urinary N:fecal N ratio (P < 0.05). A RAC x Lys interaction was observed for N digestibility, excretion, and retention and fecal and urinary N (P < 0.05). By improving N and water utilization in finishing pigs, RAC containing diets supplemented with sufficient Lys can reduce the environmental footprint of pork production. | en_US |
| dc.identifier.uri | http://hdl.handle.net/10388/etd-03242009-180055 | en_US |
| dc.language.iso | en_US | en_US |
| dc.subject | Ractopamine | en_US |
| dc.subject | Nitrogen excretion | en_US |
| dc.subject | Environment | en_US |
| dc.subject | Water | en_US |
| dc.subject | Swine | en_US |
| dc.title | Ractopamine hydrochloride and the environmental sustainability of pork production | en_US |
| dc.type.genre | Thesis | en_US |
| dc.type.material | text | en_US |
| thesis.degree.department | Animal and Poultry Science | en_US |
| thesis.degree.discipline | Animal and Poultry Science | en_US |
| thesis.degree.grantor | University of Saskatchewan | en_US |
| thesis.degree.level | Masters | en_US |
| thesis.degree.name | Master of Science (M.Sc.) | en_US |