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Daytime temperatures of 25КC and above can be sufficient to depress intakes, restrict milk yields and reduce conception rates, he warns, and walking (to and from water troughs and milking) only serves to exacerbate the problem by increasing body temperatures further. Grazing management should ensure easy access to water and shade, whilst research has shown that the inclusion of the live yeast culture Yea-Sacc1026 in supplementary rations has a positive impact on intakes, milk yield and overall feed efficiency when cows are under mild heat stress, he says. “It is important to understand that the heat on cows’ backs whilst grazing can be substantially greater than officially recorded temperatures, as these are generally taken in the shade,” explains Neil Keane. “So there will be far more days at 25КC plus for our cows than we might imagine and this is the threshold beyond which performance can be affected. “Also, higher yielding cows are more susceptible to heat stress, which increases the overall impact on the herd. “Walking raises cows’ body temperatures under any conditions, and during the summer months this can become critical. A 600 metre walk, for example, will raise body temperature by 0.7КC and, more importantly, it then takes two hours to return to normal. “Sensible practical measures should, therefore, include minimising distances that cows must walk by ensuring close proximity of water troughs and ensuring shade is never too far away. “Research on the effect of including Yea-Sacc was carried out when daytime temperatures ranged from 18КC to 28КC – so not excessive even by UK standards – yet the impact was to increase dry matter intakes, lift daily milk yields from 30.6 to 33 litres/cow and improve feed efficiency by almost 4%.” Table: The effects on dairy cow performance of including Yea-Sacc1026 yeast culture when heat stress is a factor Control rationControl + Yea-SaccMilking cows1212Minimum daily temperature (degrees C)1818Maximum daily temperature (degrees C)2828Dry matter intakes (kg/cow/day)19.620.4Milk yield (kg/cow/day)30.633.0Protein yield (kg/cow/day)0.820.88Feed efficiency (kg milk/kg DMI)1.561.62 (+0.38%) Source: Novais et al, 2006 -Ends- Picture captions: [Cows out of shade endure higher temperatures] Cows without the opportunity for shade can be exposed to temperatures high enough to impair performance, even in an average British summer, says Alltech’s Neil Keane. [Easy access to water for cows] Easy access to water is one essential management priority, especially during the summer months. June 17, 2009 Further information from: Neil Keane Alltech UK Ltd Tel: 01780 764512 Issued by Matt Mellor, Agribusiness Communications Limited Tel: 01694 731777 E-mail: matt@abccomms.co.uk This text of this news release can be downloaded directly from the ABC Press Centre (livestock page) at  HYPERLINK "http://www.abccomms.co.uk" www.abccomms.co.uk <&'Љ­56Э Ю  Ю 5 6 = > ћ = A n Я с т Ййиlm”•–ЈЉЊЋљѓючюсючючюючючюѓйѓюбЬЦЬЦЬНюЙБЙІБ БЙю 0J6]j6U]j6U]6]^JaJmHsH 6^JaJ^JaJ5\^JaJ5H*mH sH  H*mH sH  ^JmH sH mH sH  5mH sH  \mH sH &<=  ?@ЄЅ    Ю Я њ ћ H n o ~ ‘ §јјјјяяяяяяяяяящяяу§нзЮЮ $$Ifa$$If„а`„а„`„„ў`„ў$„ў`„ўa$$a$Ћў‘ ’ Ÿ Ђ Ѕ І Ь Я в г љ ќ tPneetДneetДne $$Ifa$$IfŠ$$If–lжжF”џ,P,"˜$ м tрж0џџџџџџі6ііж џџџж џџџж џџџж џџџ4ж4ж laі ќ џ % * + C H M N i іkЌeііkŒeііk˜e$IfŠ$$If–lжжF”џ,P,"˜$ м tрж0џџџџџџі6ііж џџџж џџџж џџџж џџџ4ж4ж laі $$Ifa$ i n s t • š Њ Ћ Ќ Ч Ш ііkмeііkccc$IfŠ$$If–lжжF”џ,P,"˜$ м tрж0џџџџџџі6ііж џџџж џџџж џџџж џџџ4ж4ж laі $$Ifa$ Ш Я с т ИЙй9:HIn—˜гЊЋњјјјјјјјјјјјјјјјјјјј$a$,1hАа/ Ар=!А"А# $ %ААФАФ ФщDаЩъyљКЮŒ‚ЊKЉ www.abccomms.co.ukрЩъyљКЮŒ‚ЊKЉ Nhttp://www.abccomms.co.uk/yXє;HЏ,‚]Ф…'cЅЋ i@@ёџ@ Normal CJOJQJ_HaJmH sH tH <A@ђџЁ< Default Paragraph Font4B`ђ4 Body Text$a$mH sH .U@Ђ. 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