8/10/2019 J ANIM SCI-1991-Hardt-2310-20.pdf

1/13

P F Hardt, W R Ocumpaugh and L W Greenegrazing cereal pastures fertilized with sulfur.

Forage mineral concentration, animal performance, and mineral status of heifers

1991, 69:2310-2320.J ANIM SCI

http://www.journalofanimalscience.org/content/69/6/2310the World Wide Web at:

The online version of this article, along with updated information and services, is located on

www.asas.org

by guest on November 3, 2014www.journalofanimalscience.orgDownloaded from by guest on November 3, 2014www.journalofanimalscience.orgDownloaded from

http://http//www.journalofanimalscience.org/content/69/6/2310http://http//www.journalofanimalscience.org/content/69/6/2310http://www.asas.org/http://www.journalofanimalscience.org/http://www.journalofanimalscience.org/http://www.journalofanimalscience.org/http://www.journalofanimalscience.org/http://www.journalofanimalscience.org/http://www.journalofanimalscience.org/http://www.journalofanimalscience.org/http://www.asas.org/http://http//www.journalofanimalscience.org/content/69/6/2310

8/10/2019 J ANIM SCI-1991-Hardt-2310-20.pdf

2/13

FORAGE MINERAL CONCENTRATION, ANIMAL PERFORMANCE,

AND MINERAL STATUS OF HEIFERS GRAZING CEREAL

PASTURES FERTILIZED WITH SULFUR'

P.

F.

Hardt2,

W.

R. Ocumpaugh3 and L. W. Greene2

Texas A M University and Texas Agricultural

Experiment Station, College Station 77843

ABSTRACT

Thirty yearling Santa

Gertrudis-sired

heifers (average initial weight

238 kg)

were

continuously grazed (five heiferdpasture) on six 2-ha oat-wheat small grain pastures for

112 d to determine the effect of feailization of pastures with urea

0

s ammonium sulfate

(AS) on mineral s t a t u s and performance of heifers. Pastures were fertiiized with either

U,

at

200 kglha, or

AS,

at 438 kg/ha, to provide 92 kg

of

N/ha in November 1987 and March

1988. Ammonium sulfate provided

107

kg of S/ha. Forage samples were collected during

each month. Heifers were initially weighed following an overnight fast and at the end of

four consecutive 28-d intervals (Periods 1 to

4).

Serum and ruminal fluid were collected on

d

56

and

112.

Pastures fertilized with AS had a greater

(P e .lo)

in vitro

ry

matter

disappearance during Periods 2 and 3. Ammonium sulfate-fertilized pastures had greater P

e .05) S

concentrations from January

29

through termination of the

trial.

There were no

differences in

DG P

e 28) or gain/ha (GPH; P