Intensive Grazing/Seasonal Dairying: The Mahoning County Dairy Program

1987-1991

OARDC Research Bulletin 1190

Chapter 7: Tables

Table 7.1. Parity distribution of lactating animals during the trial.
		Year
Breed	Lactation Number	1987	1988	1989	1990	1991
Holstein	1	14	8	8	6	9
	2	--	7	3	4	3
	3	--	--	7	5	9
Subtotal		14	15	18	15	21
Jersey	1	15	4	6	6	10
	2	--	11	4	5	5
	3	--	--	8	6	7
Subtotal		15	15	18	17	22
Total		29	30	36	32	43

Table 7.2. Millk production and milk composition by cows during the trial.
	Year
Items	1987	1988	1989	1990	1991
HOLSTEIN
MiLk, Ib/d	41.0	52.9	51.6	57.3	60.6
4% FCM,Ib/d.	37.0	50.3	47.4	52.2	54.7
Milk fat,%	3.42	3.73	3.51	3.47	3.40
MiLk protein,%	2.95	3.11	3.12	3.11	3.05
MiLk fat/protein	1.16	1.20	1.13	1.12	1.11
Days in milk	243	250	257	274	277
Adj. RHA midst lb²	9,908	10,481	13,860	16,131	16,883
MiLk yield, Ib/acre³	354	299	396	461	482
Adj. RHA fat,Ib²	335	388	478	558	575
Adj. RHA protein, Ib²	--	322	428	498	516
305-day ME milk, Ib⁴	15,185	17,540	16,616	19,196	19,906
305-day ME fat, Ib⁴	514	659	582	666	683
305-day ME 4% FCM,Ib⁴	13,779	16,907	15,379	17,659	18,212
JERSEY
MiLk Ib/d	32.4	37.7	38.6	41.2	43.9
4% FCM, Ib/d	34.2	40.8	42.1	44.8	46.5
MiLk fat, %	4.46	4.66	4.68	4.62	4.47
MiLk protein, %	3.50	3.74	3.69	3.70	3.58
MiLk fat/protein	1.27	1.25	1.27	1.25	1.25
Days in miLk	230	261	266	269	282
Adj. RHA mills,lb²	7,824	7,533	10,728	11,585	12,260
Mills yield, Ib/acre³	279	215	307	331	350
Adj. RHA fat, lb²	344	333	498	536	547
Adj. RHA protein, Ib²	--	276	392	423	437
305-day ME milk Ib⁴	11,378	12,225	12,203	13,453	14,740
305-day ME fat, Ib⁴	500	560	571	622	657
305-day ME 4% FCM, lb⁴	12,057	13,330	13,448	14,700	15,756
¹ Kilograms (kg) = Ib/2.2.
² Adjusted rolling herd average (Adj. RHA) calculated from DHI records by dividing total product yield for months of actual production by the average number of cow days.
³ Adjusted RHA mills yield divided by acres grazed, assuming 28 acres grazed in 1987 and 35 acres grazed during 1988 through 1991.
⁴ The extended 305-day product yield calculated during tne last month of production was convened to a mature equivalent (ME) basis.

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