Brihat Samhita
गोप्रवेशसमये अग्रतो वृषो याति कृष्णपशुरेव वा पुरः । भूरि वारि शबले तु मध्यमं नो सिते अम्बुपरिकल्पनापरैः ॥ २४-३५ ॥
If, towards nightfall, on the Rohiṇī Yoga day, when cattle, led out in the morning, re-enter the town, the first animal so entering should be either an ox or a goat of white colour, there will be no rain; if it should be an animal black-white in colour there will be moderate rain; if in the last case the black colour should predominate, the rainfall will be abundant. If the animal that enters first should be of any other colour, there will be slight rain.
english translation
gopravezasamaye agrato vRSo yAti kRSNapazureva vA puraH । bhUri vAri zabale tu madhyamaM no site ambuparikalpanAparaiH ॥ 24-35 ॥
hk transliteration by Sanscript