1991
DOI: 10.2508/chikusan.62.1156
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Relationship between Photoperiod and Seasonality of Milk Production in Dairy Cattle

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“…PRL in plasma is positively correlated to temperature, but unlike the response to changes in light, the response to changes in temperature comes within hours (Wetteman & Tucker, 1974). The covariation between changes in light over the year and milk production was also shown by Chew et al (1979) and by Kashiwamura et al (1991), and the one between 3 changes in light and growth rate of bulls by Mossberg (1992). This supports the hypothesis that it is the steady change in ligh that is crucial for a biological response such as growth rate and milk production.…”
Section: Effect Of Changes In Light In Established Lactationmentioning
confidence: 87%
“…PRL in plasma is positively correlated to temperature, but unlike the response to changes in light, the response to changes in temperature comes within hours (Wetteman & Tucker, 1974). The covariation between changes in light over the year and milk production was also shown by Chew et al (1979) and by Kashiwamura et al (1991), and the one between 3 changes in light and growth rate of bulls by Mossberg (1992). This supports the hypothesis that it is the steady change in ligh that is crucial for a biological response such as growth rate and milk production.…”
Section: Effect Of Changes In Light In Established Lactationmentioning
confidence: 87%
“…The upper limit of pLWG at each date was distinct, and the pLWG below this limit was diffused, because of the positive age and negative age 2 effects of this regression. Chemineau et al, 1992) but all the studies that examined the response of quantitative traits such as food intake (Ingvartsen et al, 1992;Walkden-Brown et al, 1994;Mossberg and Jonsson, 1996), milk yield (Kashiwamura et al, 1991) and growth rate (Mossberg and Jonsson, 1996) suggest a progressive response to photoperiod. The highest gain was predicted for 19 May, and the lowest for 18 November, which means that the gain sinusoid preceded that of the day length by 33 days, as a result of the combined positive effects of DL and DLC.…”
Section: Resultsmentioning
confidence: 99%