ðɪ ɐmˈaʊnt ʌv pɹˈoʊtiːn ɪn ɐ mˈeɪlz spˈɜːmɐtˌɑːfoːɹ ɪz nˈɛɡətˌɪvli kˈɔɹɪlˌeɪɾᵻd wɪð ˈeɪdʒ bɪkˈʌz ɪɾ ɪz mˈoːɹ lˈaɪkli fɔːɹ ˈoʊldɚ mˈeɪlz tə hæv mˈeɪɾᵻd pɹˈiːviəsli.
The amount of protein in a male's spermatophore is negatively correlated with age because it is more likely for older males to have mated previously.