Abstract
Eighty crossbred barrows (initial wt = 131 lb) were utilized to determine the dietary threonine requirement of finishing pigs injected with porcine somatotropin (PST). Barrows were injected daily in the extensor muscle of the neck with either 4 mg pST or a placebo and fed diets containing either .45, .55, .65, or .75% threonine. All other amino acids, vitamins, and minerals were calculated to be at least double current requirements for finishing pigs so as not to limit performance. Pigs were housed in an open-sided building with two pigs per pen and five replications of the eight treatments. Feed and water were provided ad libitum. When the mean weight of the two pigs per pen averaged 235 +1- 5 lb, pigs were slaughtered and carcass data collected. Porcine somatotropin-treated pigs had greater average daily gain (ADG), reduced daily feed intake (ADFI), and improved feed efficiency (F/G) compared to control pigs. A dietary threonine X pST interaction was observed for ADG. Control pigs exhibited no improvement in ADG with increasing dietary threonine. However, pST-treated pigs had a 22% increase in ADG as dietary threonine increased from .45 to .65%. Increasing dietary threonine resulted in increased ADFI, but had no effect on F/G. Average backfat thickness, tenth rib fat depth, and kidney fat were reduced by pST administration. Longissimus muscle area and trimmed ham and loin weights were greater in pST treated pigs. Dietary threonine tended to reduce average backfat thickness but had no effect on other carcass criteria measured. These results suggest that growth rate of pST-treated pigs is increased by dietary threonine level compared to control pigs. This interactive response between pST and threonine was not observed in feed efficiency or carcass criteria measured; however, there were numerical trends similar to those observed for daily gain.; Swine Day, Manhattan, KS, November 21, 1991
Highlights
Eighty crossbred barrows were utilized to determine the dietary threonine requirement of finishing pigs injected with porcine somatotropin (PST)
A dietary threonine X pST interaction was observed for average daily gain (ADG)
Control pigs exhibited no improvement in ADG with increasing dietary threonine
Summary
The influence of dietary threonine on growth performance and carcass characteristics of pST-treated finishing pigs Follow this and additional works at: https://newprairiepress.org/kaesrr Part of the Other Animal Sciences Commons Recommended Citation Laurin, J L.; Hansen, J A.; Schricker, B R.; Goodband, Robert D.; and Nelssen, Jim L.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Kansas Agricultural Experiment Station Research Reports
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
