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Moreira VE, Veroneze R, Teixeira ADR, Campos LD, Lino LFL, Santos GA, Silva BAN, Campos PHRF. Effects of Ambient Temperature on the Performance and Thermoregulatory Responses of Commercial and Crossbred (Brazilian Piau Purebred Sires × Commercial Dams) Growing-Finishing Pigs. Animals (Basel) 2021; 11:ani11113303. [PMID: 34828034 PMCID: PMC8614347 DOI: 10.3390/ani11113303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 11/10/2021] [Accepted: 11/16/2021] [Indexed: 11/17/2022] Open
Abstract
Simple Summary Physiological responses to heat stress are affected by breed. Therefore, crossbreeding genetically improved lines with tropically adapted breeds of pigs may be a strategy to attenuate the impact of high ambient temperatures on pig production. Although some studies have evaluated thermotolerance in tropically adapted breeds, it is not yet clear to which extent improved tolerance to heat stress is a consequence of a greater ability to equilibrate thermogenesis and thermolysis, or if it is a consequence of decreased growth performance. Although there was no interaction for performance, thermoregulatory responses, and blood parameters, our results evidenced that ambient temperature effects on carcass parameters were modulated by the pigs’ genotype. Because protein deposition significantly decreased in response to high ambient temperature in commercial pigs, and was not affected by ambient temperature in Piau crossbred pigs, our study suggests increased thermotolerance of Piau crossbred pigs. Abstract The study aimed at evaluating the effects of high ambient temperature (HT: 30 °C) on the thermoregulatory responses and performance of commercial and Piau crossbred (Brazilian Piau breed sires × commercial genotype dams) growing pigs. Commercial and Piau crossbred pigs were reared under thermoneutral (TN: 22 °C) or HT conditions during a 14-day experimental period. Feeding (daily) and animals (beginning and end) were weighted to obtain performance parameters. Skin and rectal temperatures, respiratory rate, and blood parameters were also measured. At the end of the trial (day 15), the animal’s backfat thickness (BF) and loin eye area (LEA) were measured. No interaction (p > 0.05) between the genetic group and ambient temperature was observed for any performance trait. Irrespective of ambient temperature, Piau crossbred pigs had a similar feed intake (ADFI, 2615 g/day, on average; p > 0.05), lower daily weight gain (ADG, −234 g/day; p < 0.01), and a higher feed conversion ratio (FCR, +0.675 g/g; p < 0.01). There was interaction (p = 0.01) between genotype and ambient temperature for the LEA that decreased significantly in response to HT in commercial pigs (−6.88 cm2) and did not differ in response to ambient temperature in Piau crossbred pigs (29.14 cm2, on average; p > 0.05). Piau crossbred pigs had greater BF (+7.2 mm; p < 0.01) than commercial pigs. Regardless of the genetic group, exposure of pigs to HT resulted in decreased ADFI (−372 g/day; p < 0.01), ADG (−185 g/day; p < 0.01), and a higher FCR (+0.48 g/g; p = 0.01). Ambient temperature did not affect lipid deposition. Pigs at HT had an increased respiratory rate (+38 bpm; p < 0.01) and a long-lasting increase in skin and rectal temperatures compared to TN pigs. Total concentrations of triiodothyronine (T3) and thyroxine (T4) were not affected by ambient temperature in commercial pigs, whereas Piau crossbred pigs kept at 30 °C had a transient decrease in both hormones at day 2 (p < 0.01). Serum cortisol concentrations were not affected (p > 0.05) by genotype nor ambient temperature. In summary, Piau crossbred pigs had lower efficiency using nutrients for growth in association with increased lipid deposition when compared to commercial pigs. In response to HT, commercial pigs had a decreased LEA, whereas no effect was observed for Piau crossbred pigs. Apart from that, commercial and Piau crossbred pigs had a similar magnitude of thermoregulatory responses activation in response to HT, evidencing their innate survival-oriented function.
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Affiliation(s)
- Vinícius Eduardo Moreira
- Animal Science Postgraduate Program, Department of Animal Science, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina 39100-000, MG, Brazil; (V.E.M.); (A.d.R.T.)
- Department of Animal Science, Universidade Federal de Viçosa, Viçosa 36570-900, MG, Brazil; (R.V.); (L.D.C.); (L.F.L.L.); (G.A.S.)
| | - Renata Veroneze
- Department of Animal Science, Universidade Federal de Viçosa, Viçosa 36570-900, MG, Brazil; (R.V.); (L.D.C.); (L.F.L.L.); (G.A.S.)
| | - Alípio dos Reis Teixeira
- Animal Science Postgraduate Program, Department of Animal Science, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina 39100-000, MG, Brazil; (V.E.M.); (A.d.R.T.)
| | - Lorena Duarte Campos
- Department of Animal Science, Universidade Federal de Viçosa, Viçosa 36570-900, MG, Brazil; (R.V.); (L.D.C.); (L.F.L.L.); (G.A.S.)
| | - Lais Fernanda Lopes Lino
- Department of Animal Science, Universidade Federal de Viçosa, Viçosa 36570-900, MG, Brazil; (R.V.); (L.D.C.); (L.F.L.L.); (G.A.S.)
| | - Gabryele Almeida Santos
- Department of Animal Science, Universidade Federal de Viçosa, Viçosa 36570-900, MG, Brazil; (R.V.); (L.D.C.); (L.F.L.L.); (G.A.S.)
| | - Bruno Alexander Nunes Silva
- Institute of Agricultural Sciences, Department of Animal Science, Universidade Federal de Minas Gerais, Montes Claros 39404-547, MG, Brazil;
| | - Paulo Henrique Reis Furtado Campos
- Department of Animal Science, Universidade Federal de Viçosa, Viçosa 36570-900, MG, Brazil; (R.V.); (L.D.C.); (L.F.L.L.); (G.A.S.)
- Correspondence:
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