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首页> 外文期刊>Journal of dairy science >Physiological responses and lactational performances of late-lactation dairy goats under heat stress conditions
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Physiological responses and lactational performances of late-lactation dairy goats under heat stress conditions

机译：热应激条件下晚期哺乳山羊的生理反应和泌乳性能

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摘要

Eight Murciano-Granadina dairy goats in late lactation were exposed to different ambient conditions, using metabolic cages in a climatic chamber. The experimental design was a crossover (2 periods of 35 d and 4 goats each) and conditions were (1) thermal neutral (TN; 15 to 20℃ day-night) and (2) heat stress (HS; 12-h day at 37℃ and 12-h night at 30.5℃). Humidity was maintained at 40% and light-dark was constant (12-12 h). The forage:concentrate ratio was adjusted daily for maintaining similar value in TN and HS goats (70:30). Water was freely available at ambient temperature. Rectal temperature and respiratory rate (0800, 1200 and 1700 h) and milk yield were recorded daily, whereas milk composition, nonesterified fatty acids and haptoglobin in blood were analyzed weekly. At d 25, additional blood samples were taken for analysis of metabolites and indicators of the acid-base balance. Digestibility coefficients and N balance were determined (d 31 to 35) and body weight was recorded (d 35). Compared with TN goats, HS goats experienced greater rectal temperature (+0.58℃), respiratory rate (+48 breaths/min), water intake (+77%) and water evaporation (+207%). Intake of HS goats rapidly declined until d 7 (-40%), partially recovered from d 7 to 19, and steadied thereafter (-14%). No changes in digestibility or N balance were detected. Blood nonesterified fatty acids and haptoglobin peaked at d 7 in HS goats but did not vary thereafter. Although milk yield did not vary by treatment, milk of HS goats contained -12.5% protein and -11.5% casein than TN goats. Panting reduced concentration and pressure of CO_2 in the blood of HS goats, but they were able to maintain their blood pH similar to the TN group by lowering HCO_3~- and increasing Cl~ concentrations in their blood. In conclusion, HS dairy goats showed dramatic physiological changes during the first week of treatment and partially recovered thereafter. They were able to maintain milk yield by losing body mass, but milk protein content and protein yield were depressed. Further research is needed to assess the response of dairy goats to HS at earlier stages of lactation.
机译：哺乳后期，使用气候笼中的新陈代谢笼子将八只Murciano-Granadina奶山羊暴露在不同的环境条件下。实验设计是一个交叉实验（2个周期35天，每个周期4个山羊），条件是（1）热中性（TN；昼夜15至20℃）和（2）热应激（HS；在12h时37℃，晚上30.5℃12小时）。湿度保持在40％，明暗保持恒定（12-12小时）。每天调整饲草：精料比率，以保持TN和HS山羊的相似值（70:30）。在环境温度下可自由获得水。每天记录直肠温度和呼吸频率（0800、1200和1700 h）和牛奶产量，而每周分析血液中的牛奶成分，非酯化脂肪酸和触珠蛋白。在第25天，采集额外的血液样本以分析代谢产物和酸碱平衡指标。测定消化系数和氮平衡（d 31至35），并记录体重（d 35）。与TN山羊相比，HS山羊的直肠温度更高（+ 0.58℃），呼吸频率（+48呼吸/分钟），摄水量（+ 77％）和水分蒸发（+ 207％）。 HS山羊的摄入量迅速下降直至第7天（-40％），从第7天到19天部分恢复，此后稳定下来（-14％）。没有检测到消化率或氮平衡的变化。 HS山羊的血液中非酯化脂肪酸和触珠蛋白在d 7达到峰值，但此后没有变化。尽管不同处理方式的牛奶产量没有变化，但是与TN山羊相比，HS山羊的牛奶含有-12.5％的蛋白质和-11.5％的酪蛋白。气喘吁吁地降低了HS山羊血液中CO_2的浓度和压力，但它们能够通过降低HCO_3〜-和增加血液中Cl〜的浓度来保持与TN组相似的血液pH值。总之，HS奶山羊在治疗的第一周内表现出明显的生理变化，此后部分恢复。他们能够通过减轻体重来维持产奶量，但牛奶蛋白质含量和蛋白质产量却降低了。需要进一步的研究来评估奶山羊在泌乳早期对HS的反应。

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  • 来源
    《Journal of dairy science》 |2013年第10期|6355-6365|共11页
  • 作者

    S. Hamzaoui; A. A. K. Salama; E. Albanell; X. Such; G. Caja;

  • 作者单位

    Grup de Recerca en Remugants (G2R), Departament de Ciencia Animal i dels Aliments, Universitate Autonoma de Barcelona, 08193 Bellaterra, Spain;

    Grup de Recerca en Remugants (G2R), Departament de Ciencia Animal i dels Aliments, Universitate Autonoma de Barcelona, 08193 Bellaterra, Spain,Sheep and Goat Research Department, Animal Production Research Institute, 12311 Dokki, Giza, Egypt;

    Grup de Recerca en Remugants (G2R), Departament de Ciencia Animal i dels Aliments, Universitate Autonoma de Barcelona, 08193 Bellaterra, Spain;

    Grup de Recerca en Remugants (G2R), Departament de Ciencia Animal i dels Aliments, Universitate Autonoma de Barcelona, 08193 Bellaterra, Spain;

    Grup de Recerca en Remugants (G2R), Departament de Ciencia Animal i dels Aliments, Universitate Autonoma de Barcelona, 08193 Bellaterra, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    heat stress; lactation; digestibility; dairy goat;

    机译：热应激;哺乳期消化率奶山羊;

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