Comparison of milk production and endocrine profiles of dairy cows exposed to either white light-emitting diode or induction lighting

IF 1.9 2区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Y. Inabu , Y. Takakura , Y. Shinohara , M. Sunadome , R. Watanabe , S. Kushibiki , T. Sugino
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Abstract

White light-emitting diodes (WLEDs) are characterized by their high blue light intensity, whereas induction lighting (IL) emits lower levels of blue light. This study investigated the effects of exposure to WLED and IL on milk production and physiological responses in dairy cows. Nine lactating Holstein cows [225 ± 32.5 days in milk, 710 ± 24.6 kg initial body weight (BW), 2.6 ± 1.6 parity] were kept under a 16:8 h light-dark cycle and assigned to two treatments for 3 wk each in a 2 × 2 crossover design: exposure to either WLED (443 nm peak wavelength, 231 lx) or IL (529 nm peak wavelength, 237 lx). During the dark period, light intensity was 0.0 lx. All cows were fed total mixed ration ad libitum. Milk samples were collected weekly, and serial blood sampling was performed on the last day of each treatment. Dry matter intake, BW, milk yield, and milk composition did not differ between treatments. However, plasma non-esterified fatty acids concentration tended to be higher for the WLED than for the IL (P = 0.09). In addition, plasma melatonin and cortisol concentrations were higher (P < 0.01) for the WLED group than for the IL group. These findings suggest that differences in light wavelength between WLED and IL affect melatonin and cortisol secretion and may also impact lipid metabolism, without altering milk production performance.
白光二极管和感应照明对奶牛产奶量和内分泌的影响
白光发光二极管(wled)的特点是蓝光强度高,而感应照明(IL)则发出较低水平的蓝光。本研究探讨了WLED和IL暴露对奶牛产奶量和生理反应的影响。9头泌乳荷斯坦奶牛(产奶225±32.5天,初始体重710±24.6 kg,胎次2.6±1.6次)处于16:8 h的光照-暗循环下,按2 × 2交叉设计分为两个处理,每个处理3周:暴露于WLED (443 nm峰值波长,231 lx)或IL (529 nm峰值波长,237 lx)。暗期光照强度为0.0 lx。所有奶牛均饲喂全混合日粮。每周采集牛奶样本,并在每次治疗的最后一天进行连续血液采样。干物质采食量、体重、产奶量和乳成分在不同处理间无显著差异。然而,WLED组血浆非酯化脂肪酸浓度高于IL组(P = 0.09)。此外,血浆褪黑激素和皮质醇浓度较高(P <;WLED组与IL组比较差异有0.01)。这些发现表明,WLED和IL之间的波长差异会影响褪黑激素和皮质醇的分泌,也可能影响脂质代谢,但不会改变泌乳性能。
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来源期刊
Domestic animal endocrinology
Domestic animal endocrinology 农林科学-奶制品与动物科学
CiteScore
5.50
自引率
4.80%
发文量
58
审稿时长
31 days
期刊介绍: Domestic Animal Endocrinology publishes scientific papers dealing with the study of the endocrine physiology of domestic animal species. Those manuscripts utilizing other species as models for clinical or production problems associated with domestic animals are also welcome. Topics covered include: Classical and reproductive endocrinology- Clinical and applied endocrinology- Regulation of hormone secretion- Hormone action- Molecular biology- Cytokines- Growth factors
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