Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
muslim:1961j[Chain 1] Ibn al-Muthanná > Wahbb. Jarīr [Chain 2] Isḥāq b. Ibrāhīm > Abū ʿĀmir al-ʿAqadī

This hadith has been narrated on the authority of Shu'ba with the same chain of transmitters, but did not mention tht doubt (expressed in his statement) That is (the goat of less than a year) is better than a goat of more than one year.  

مسلم:١٩٦١jوَحَدَّثَنَاهُ ابْنُ الْمُثَنَّى حَدَّثَنِي وَهْبُ بْنُ جَرِيرٍ ح وَحَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ أَخْبَرَنَا أَبُو عَامِرٍ الْعَقَدِيُّ

حَدَّثَنَا شُعْبَةُ بِهَذَا الإِسْنَادِ وَلَمْ يَذْكُرِ الشَّكَّ فِي قَوْلِهِ هِيَ خَيْرٌ مِنْ مُسِنَّةٍ