mature.cow: Calculate requirements for mature cows and first calf heifers

In sgadberry/beefnrc: Functions Based on Nutrient Requirements of Beef Cattle

Description

mature.cow returns calculated requirements for mature cows and first calf heifers as daily totals and proportion of dry matter intake.

Usage

mature.cow(breed.code = 1, mbw.lbs = 1200, milk.pk.lb = 20, RMY = 5,
  first.calf = FALSE, first.calf.NEmadj = 1.25)

Arguments

breed.code	Default is 1 = Angus. Breed code must match a code listed in the table 19_1 data file.
mbw.lbs	Default is 1200. This value represents the mature, unshrunk bw (lbs) for cows > 3 yrs old. For first calf heifers, calving at 2 yr is assumed. mbw.lbs is the estimated mature weight for first calf heifers, and equations are based on a shrunk bw of 0.85(mbw) at first calving and 0.9(mbw) at second calving.
milk.pk.lb	Default is 20. Users can modify peak milk (lbs). Peak milks is estimated to occur at 8.5 weeks after calving.
RMY	Default is 5. Relative Milk Yield (RMY) is a convenient method of adjusting milk production.
first.calf	Default is FALSE. Change to TRUE to adjust requirements for first calf heifers.
first.calf.NEmadj	Default is 1.25. This value can be changed to NRC default 1.

Value

Two tables are printed including nutrient requirement totals and nutrient requirement as a proportion of dry matter intake.

Examples

mature.cow()
mature.cow(breed.code=4)
mature.cow(breed.code=4,first.calf=TRUE)

sgadberry/beefnrc documentation built on May 7, 2019, 3:33 p.m.