The influence of oestrous substances on cyclicity and oestrous behaviour in dairy heifers.

The effect of time period on the score was highly significant (p < 0.001) for all variables except for appearance of genitalia (p = 0.025).

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However, in many countries the consumers show reluctance to accept the use of hormones in healthy animals and there is a strong trend for limiting the use of exogenous reproductive hormones in Northern Europe.

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