Requirements of young stock

Young stock target liveweights

Note: The feed requirement figures are 'eaten' feed demand plus 6% to allow for feed wastage observed under good feeding conditions of pasture in farmlet trials. Where feed (pasture or supplement) wastage rates are higher than those stated, requirements for feed offered need to be increased. The requirements are calculated for pasture at 11.0 MJ ME/kg DM. For different pasture quality make the following adjustments to calculate ME or DM requirements.

Young stock target liveweights - kg Lwt

	*Age in months*	3	6	9	15	22
	% of mature liveweight target	20%	30%	40%	60%	90%
Breed	Mature Lwt kg
Jersey	350	70	105	140	210	315
Jersey	400	80	120	160	240	360
J x F	450	90	135	180	270	405
Friesian	500	100	150	200	300	450
Friesian	550	110	165	220	330	495

Total daily requirements

Young stock total kg DM requirements: kg DM/head/day at 11.0 MJ ME/kg DM

Breed	Mature Lwt kg	3-10 months	11-22 months	3-22 months
Jersey	350	770	2,115	2,885
Jersey	400	865	2,370	3,235
J x F	450	960	2,630	3,585
Friesian	500	1,050	2,880	3,930
Friesian	550	1,145	3,130	4,275

Daily young stock requirements: kg DM/head/day at 11.0 MJ ME/kg DM (Age in months and % of mature Lwt)

Breed	Lwt gain kg/day	3 (20%)	6 (30%)	9 (40%)	15 (60%)	18 (73%)	21 (86%)	22 (90%)
Jersey	0.45	2.7	3.5	4.2	5.7	6.5	7.7	8.4
J x F	0.55	3.2	4.1	5.0	6.6	7.6	9.0	9.9
Friesian	0.64	3.6	4.6	5.7	7.6	8.7	10.3	11.2

Estimating liveweight of dairy heifers

Girth (metres)	Height (metres)	Body weight (kgs)
0.85-0.87	0.75-0.76	50
1.00-1.05	0.90-0.92	100
1.03	0.90	120
1.12	0.95	140
1.19	0.99	160
1.25	1.02	180
1.31	1.05	200
1.36	1.07	220
1.41	1.09	240
1.45	1.11	260
1.48	1.12	270
1.50	1.13	280
1.54	1.15	300
1.59	1.17	320
1.62	1.19	340