Effect of a dual enteric and respiratory pathogen challenge on swine growth, efficiency, carcass composition, and pork quality1
| Autor: | B. M. Patterson, Steven M. Lonergan, Elisabeth J. Huff-Lonergan, Nicholas K. Gabler, Kent Schwartz, Amanda C. Outhouse, Wendy M. Rauw, Emma T Helm, Jack C. M. Dekkers |
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| Rok vydání: | 2019 |
| Předmět: |
Male
Swine Marbled meat Lawsonia Bacteria Biology Loin Feed conversion ratio Acclimatization Lawsonia intracellularis 03 medical and health sciences Animal science Genetics Animals Featured Collection 030304 developmental biology Swine Diseases 0303 health sciences Coinfection Body Weight Mycoplasma hyopneumoniae 0402 animal and dairy science 04 agricultural and veterinary sciences General Medicine Pneumonia of Swine Mycoplasmal 040201 dairy & animal science Desulfovibrionaceae Infections Body Composition Pork Meat Female Animal Science and Zoology Composition (visual arts) Residual feed intake Barn (unit) Food Science |
| Zdroj: | J Anim Sci |
| ISSN: | 1525-3163 0021-8812 |
| DOI: | 10.1093/jas/skz332 |
| Popis: | The objective of this study was to determine the influence of a dual respiratory and enteric pathogen challenge on growth performance, carcass composition, and pork quality of high and low feed efficient pigs. Pigs divergently selected for low and high residual feed intake (RFI, ~68 kg) from the 11th generation of Iowa State University RFI project were used to represent high and low feed efficiency. To elicit a dual pathogen challenge, half of the pigs (n = 12/line) were inoculated with Mycoplasma hyopneumoniae (Mh) and Lawsonia intracellularis (MhLI) on days post-inoculation (dpi) 0. Pigs in a separate room of the barn were not inoculated and used as controls (n = 12/RFI line). Pigs were weighed and feed intake was recorded to calculate ADG, ADFI, and G:F for the acclimation period (period 1: dpi −21 to 0), during peak infection (period 2: dpi 0 to 42), and during the remaining growth period to reach market weight (period 3: dpi 42 to harvest). At ~125 kg, pigs were harvested using standard commercial procedures. Carcasses were evaluated for composition (weight, fat free lean, loin eye area, 10th rib fat depth) and meat quality (pH decline, temperature decline, Hunter L, a, and b, subjective color and marbling, star probe, drip loss, cook loss, proximate composition, and desmin degradation). Challenged pigs had lesser ADFI than controls during period 2 (P < 0.05), but had greater ADG and G:F during period 3 (P < 0.05). Selection for feed efficiency did not result in a differential response to MhLI (P > 0.05). Loin chops from the less feed efficient, high RFI pigs, had greater drip loss, greater cook loss, lesser moisture content, greater Hunter L values, and greater Hunter b values (P < 0.05) than loin chops from low RFI pigs. Infection status did not significantly affect carcass composition or pork quality traits (P > 0.05). These results indicate that a MhLI challenge early in growth did not significantly affect ultimate carcass composition or meat quality traits. Selection for greater feed efficiency in pigs did not affect their response to pathogenic challenge. |
| Databáze: | OpenAIRE |
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