Effect of Cyclic Heat Stress and Supplemented Inorganic and Organic Zinc Source Levels on Grow-Finish Pig Growth Performance and Estimated Body Composition

Six hundred cross-bred pigs were housed under thermo...neutral (TN) or cycling heat (HS) conditions simulating summer heat with acute 3-day heat waves for a 70-day study. TN conditions were 18.9-16.7°C throughout the study. HS pigs were housed at the same temperature as TN from d0-18, then increasin...

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Bibliographic Details
Published in:Journal of animal science 2018-04, Vol.96, p.134-135
Main Authors: Mills, K M, Feldpausch, J A, Duttlinger, A W, Elefson, S K, Zuelly, S M, Radcliffe, J S, Rambo, Z J, Richert, B T
Format: Article
Language:English
Subjects:
Body composition
Data processing
Diet
Environmental effects
Heat stress
Heat waves
Heatstroke
Hogs
Humidity
Reduction
Summer
Temperature
Thermal cycling
Zinc
Zinc oxide
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Summary:Six hundred cross-bred pigs were housed under thermo...neutral (TN) or cycling heat (HS) conditions simulating summer heat with acute 3-day heat waves for a 70-day study. TN conditions were 18.9-16.7°C throughout the study. HS pigs were housed at the same temperature as TN from d0-18, then increasing temperatures d18-21 (28°C/24°C for 12h:12h, 50.0% humidity) followed by 30°C/26.7°C (12h:12h, 52.4% humidity) d24-70 except during acute heat (32-33°C/29-30°C, 12h:12h, 51.5% humidity) on days 21-24, 42-45, and 63-66. Treatments were arranged in a 2 ... 6 factorial with main effects of environment (HS vs. TN) and dietary zinc sup...plementation: 1) 50 mg/kg ZnO; 2) 130 mg/kg ZnO: 3) 50 mg/kg of organic Zn from Availa®Zn); 4) 50 mg/kg ZnO + 40 mg/kg Availa®Zn); 5) 50 mg/kg ZnO + 60 mg/kg Availa®Zn; and 6) 50 mg/kg ZnO + 80 mg/kg Availa®Zn. Pigs (5/pen) were blocked by initial BW (72.2 kg) and randomly allotted to 1 of 12 temperature and diet treatment combinations across 10 replicates. There were 5 rooms per thermal environment, each containing 2 blocks of dietary treatments. BW and feed intake were determined at the beginning and end of each acute heat event. All pigs were ultrasonically scanned at the 10th rib to predict loin eye area (LEA), backfat (BF), and percent lean. Data were analyzed by the GLM procedure in SAS with pen being the experi...mental unit. Pigs were marketed on d63 (TN) and d70 (HS). At d63 HS pigs were lighter (124.11 vs. 128.34 kg; P
ISSN:0021-8812
1525-3163