Guadagnin Anne R, Matiello João P, Ribeiro Rafael S, Pereira Luiz G R, Machado Fernanda S, Tomich Thierry R, Campos Mariana M, Heisler Guilherme, Fischer Vivian
Department of Animal Sciences, Federal University of Rio Grande do Sul, 7712 Bento Gonçalves Avenue, 91540-000, Porto Alegre, Rio Grande do Sul, Brazil.
Department of Bioengeneering, Fereal University of São João del-Rey, 74Dom Helvecio Square, 36307-352, São João del-Rey, Minas Gerais, Brazil.
J Therm Biol. 2023 Jul;115:103628. doi: 10.1016/j.jtherbio.2023.103628. Epub 2023 Jun 21.
Infrared thermography (IRT) is a non-invasive and efficient tool to detect changes in the animal's body surface temperature, which is directly associated with the animal's energy loss. Methane emission represents a significant energy loss, particularly in ruminants, as well as heat production. Therefore, the aim of this study was to correlate skin temperature measured using IRT with heat production (HP) and methane emission in lactating Holstein and crossbred ½ Holstein x ½ Gyr (Gyrolando-F1) cows. Six Gyrolando-F1 and four Holstein cows, all primiparous, at mid lactation were used to evaluate daily HP and methane emission using indirect calorimetry in respiratory chambers. Thermographic images were taken at anus, vulva, ribs (on the right side), left flank, right flank, right front foot, upper lip, masseter and eye; IRT was performed every hour during 8 h after the morning feeding. Cows received the same diet ad libitum. Daily methane emission was positively correlated with IRT taken at the right front foot 1 h after feeding in Gyrolando-F1 cows (r = 0.85, P < 0.05) and with IRT taken at the eye 5 h after feeding in Holstein cows (r = 0.88, P < 0.05). HP was positively correlated with IRT taken at the eye 6 h after feeding in Gyrolando-F1 cows (r = 0.85, P < 0.05) and with IRT taken at the eye 5 h after feeding in Holstein cows (r = 0.90, P < 0.05). Infrared thermography was positively correlated with HP and methane emission in both Holstein and Gyrolando-F1 lactating cows, although the anatomical points and times of image acquisition yielding the greatest correlation coefficients varies among breeds.
红外热成像技术（IRT）是一种用于检测动物体表温度变化的非侵入性高效工具，而动物体表温度变化与能量损失直接相关。甲烷排放代表着显著的能量损失，尤其是在反刍动物中，同时还有热量产生。因此，本研究的目的是将使用IRT测量的皮肤温度与泌乳期荷斯坦奶牛和 ½ 荷斯坦×½ 吉尔牛（吉罗兰多 - F1）杂交奶牛的产热（HP）及甲烷排放进行关联。选用了6头吉罗兰多 - F1奶牛和4头荷斯坦奶牛，均为头胎，处于泌乳中期，通过呼吸室中的间接量热法评估每日的产热和甲烷排放。在肛门、外阴、肋骨（右侧）、左胁腹、右胁腹、右前脚、上唇、咬肌和眼睛处拍摄热成像图；在早晨喂食后的8小时内，每小时进行一次IRT检测。奶牛自由采食相同的日粮。吉罗兰多 - F1奶牛喂食后1小时，右前脚处的IRT与每日甲烷排放呈正相关（r = 0.85，P < 0.05）；荷斯坦奶牛喂食后5小时，眼睛处的IRT与每日甲烷排放呈正相关（r = 0.88，P < 0.05）。吉罗兰多 - F1奶牛喂食后6小时，眼睛处的IRT与产热呈正相关（r = 0.85，P < 0.05）；荷斯坦奶牛喂食后5小时，眼睛处的IRT与产热呈正相关（r = 0.90，P < 0.05）。红外热成像技术与荷斯坦和吉罗兰多 - F1泌乳奶牛的产热及甲烷排放均呈正相关，尽管产生最大相关系数的解剖部位和图像采集时间在不同品种间有所差异。
