TotalProt

total protein yield for lactation, kg

TotalE

total energy yield for lactation, Mcal

TotalFat

total fat yield for lactation, kg

TotalY

total milk yield for lactation, kg

TP

total protein, kg

Tp

previous ambient temperature, °C

TP1

total body protein @ CS=1, kg

TPA

target puberty age, days

TPW

target puberty weight, kg


U

urea nitrogen recycled (percent of nitrogen intake)

UCT

upper critical temperature

UE

urinary energy

UIP

undegraded intake protein


VFA

volatile fatty acids


W

current week of lactation

WIND

wind speed, kph


X

diet crude protein, as a percentage of diet dry matter


Y

original yield for each feed

Y'

new yield for each feed

Y1j

yield efficiency of FC bacteria from the available fiber fraction of the jth feedstuff, g FC bacteria/g FC digested

Y2j

yield efficiency of NFC bacteria from the sugar fraction of the jth feedstuff, g NFC bacteria/g NFC digested

Y3j

yield efficiency of NFC bacteria from the starch fraction of the jth feedstuff, g NFC bacteria/g NFC digested

Ye

relationship of energy content of the gravid uterus

YEn

daily energy secreted in milk at current stage of lactation, Mcal (NEm)/day

YFatn

daily milk fat yield at current stage of lactation, kg/day

YG1

theoretical maximum yield of the fiber carbohydrate bacteria, 0.4 g bacteria/g FC

YG2

theoretical maximum yield of the nonfiber carbohydrate bacteria, 0.4 g bacteria/g NFC

Yn

daily milk yield at current week of lactation, kg/day

YPN

net protein required for gestation, g/day

YProtn

daily milk protein yield at current stage of lactation, kg/day


Z

age in years



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