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Control of postmortem energy metabolism.

Guo, Qinghai.

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Control of postmortem energy metabolism.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Control of postmortem energy metabolism./
Author:	Guo, Qinghai.
Description:	143 p.
Notes:	Source: Dissertation Abstracts International, Volume: 67-09, Section: B, page: 4767.
Contained By:	Dissertation Abstracts International67-09B.
Subject:	Agriculture, Food Science and Technology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3232181
ISBN:	9780542864629

Control of postmortem energy metabolism.
Guo, Qinghai.

Control of postmortem energy metabolism. - 143 p.

Source: Dissertation Abstracts International, Volume: 67-09, Section: B, page: 4767.

Thesis (Ph.D.)--Purdue University, 2006.

The purpose of this research was to understand postmortem energy metabolism in pig muscle. The first study determined the influence of the beta-adrenergic agonist ractopamine (RAC) feeding duration on postmortem energy metabolism. Pigs were fed diets containing RAC (20 mg/kg) for 0, l, 2, or 4 wk. The L* values were increased (P < 0.05) and a* values were reduced (P < 0.05) after inclusion of RAG in the diet for 4 wk. However, dietary RAC had no effect on subjective color, firmness and marbling scores. Pigs fed RAC for 4 wk had reduced (P < 0.05) muscle glycogen levels and increased (P < 0.05) glucose levels at all times postmortem. Postmortem muscle lactate levels were reduced ( P < 0.05) after feeding RAC for 1 wk and 2 wk. Postmortem muscle pH values were higher in pigs fed RAC for 2 wk compared with controls. These data showed that muscle glycogen stores can be reduced through 4 wk RAC feeding but had little positive effect on pork quality development and ultimate pH, suggesting that pork quality development is not predicted on initial muscle glycogen content. The objective of the second study was to reduce initial glycogen in halothane and Rendement Napole (RN) genotypes with RAC feeding. Pigs fed RAC had lower (P < 0.05) glycogen levels and numerically reduced initial lactate levels. Rapid early postmortem pH decline in halothane carrier pigs and lower pHu in RN carrier pigs were observed. In addition, pigs fed RAC has reduced (P < 0.05) color scores, but had no effect on firmness, marbling scores and water holding capacity. Feeding RAC increased (P < 0.05) objective L* values in halothane carrier pigs. Overall, these data suggest that the dietary RAC alters muscle carbohydrate metabolism, resulting in a 30% lower muscle glycogen content and ability of muscle to generate lactate. Furthermore, dietary RAC had no effect on pHu in RN carrier pigs even though initial muscle glycogen levels were reduced by RAC feeding, showing that adverse pork quality in RN carrier pigs was not altered by reducing muscle glycogen content. Therefore, reduced glycogen content may not be the primary factor dictating pHu in pig muscle.

ISBN: 9780542864629Subjects--Topical Terms:

1017813
Agriculture, Food Science and Technology.

Control of postmortem energy metabolism.
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035 $a (UMI)AAI3232181
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040 $a UMI $c UMI
100 1 $a Guo, Qinghai. $3 1917844
245 1 0 $a Control of postmortem energy metabolism.
300 $a 143 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-09, Section: B, page: 4767.
500 $a Advisers: David E. Gerrard; Alan L. Grant.
502 $a Thesis (Ph.D.)--Purdue University, 2006.
520 $a The purpose of this research was to understand postmortem energy metabolism in pig muscle. The first study determined the influence of the beta-adrenergic agonist ractopamine (RAC) feeding duration on postmortem energy metabolism. Pigs were fed diets containing RAC (20 mg/kg) for 0, l, 2, or 4 wk. The L* values were increased (P < 0.05) and a* values were reduced (P < 0.05) after inclusion of RAG in the diet for 4 wk. However, dietary RAC had no effect on subjective color, firmness and marbling scores. Pigs fed RAC for 4 wk had reduced (P < 0.05) muscle glycogen levels and increased (P < 0.05) glucose levels at all times postmortem. Postmortem muscle lactate levels were reduced ( P < 0.05) after feeding RAC for 1 wk and 2 wk. Postmortem muscle pH values were higher in pigs fed RAC for 2 wk compared with controls. These data showed that muscle glycogen stores can be reduced through 4 wk RAC feeding but had little positive effect on pork quality development and ultimate pH, suggesting that pork quality development is not predicted on initial muscle glycogen content. The objective of the second study was to reduce initial glycogen in halothane and Rendement Napole (RN) genotypes with RAC feeding. Pigs fed RAC had lower (P < 0.05) glycogen levels and numerically reduced initial lactate levels. Rapid early postmortem pH decline in halothane carrier pigs and lower pHu in RN carrier pigs were observed. In addition, pigs fed RAC has reduced (P < 0.05) color scores, but had no effect on firmness, marbling scores and water holding capacity. Feeding RAC increased (P < 0.05) objective L* values in halothane carrier pigs. Overall, these data suggest that the dietary RAC alters muscle carbohydrate metabolism, resulting in a 30% lower muscle glycogen content and ability of muscle to generate lactate. Furthermore, dietary RAC had no effect on pHu in RN carrier pigs even though initial muscle glycogen levels were reduced by RAC feeding, showing that adverse pork quality in RN carrier pigs was not altered by reducing muscle glycogen content. Therefore, reduced glycogen content may not be the primary factor dictating pHu in pig muscle.
590 $a School code: 0183.
650 4 $a Agriculture, Food Science and Technology. $3 1017813
650 4 $a Agriculture, Animal Culture and Nutrition. $3 1017857
690 $a 0359
690 $a 0475
710 2 0 $a Purdue University. $3 1017663
773 0 $t Dissertation Abstracts International $g 67-09B.
790 1 0 $a Gerrard, David E., $e advisor
790 1 0 $a Grant, Alan L., $e advisor
790 $a 0183
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3232181