Between the 1960s and the 2000s, there was a significant increase in livestock production, both by numbers and by carcass weight, especially among beef, pigs and chickens, the latter of which had production increased by almost a factor of 10.
bᵻtwˌiːn ðə nˈaɪntiːnhˈʌndɹɪd sˈɪksti z ænd ðə tˈuː θˈaʊzənd z, ðɛɹwˌʌz ɐ sɪɡnˈɪfɪkənt ˈɪŋkɹiːs ɪn lˈaɪvstɑːk pɹədˈʌkʃən, bˈoʊθ baɪ nˈʌmbɚz ænd baɪ kˈɑːɹkəs wˈeɪt, ɪspˈɛʃəli ɐmˌʌŋ bˈiːf, pˈɪɡz ænd tʃˈɪkɪnz, ðə lˈæɾɚ ʌvwˈɪtʃ hæd pɹədˈʌkʃən ɪŋkɹˈiːst baɪ ˈɔːlmoʊst ɐ fˈæktɚɹ ʌv tˈɛn.