Nutritional Secondary Hyperparathyroidism in the Horse

Ration 41
Table XI/. Calcium and phosphorus contents of experimental and control diets
NSH horses Control horse
Week G. Ca/day G. P/day Ca : P G. Ca/day G. P/day Ca : P
0-23 15.80 58.14 1 : 3.68 21.26 15.08 1.41 : 1
24-41 14.17 87.77 1 : 6.19 21.26 15.08 1.41 : 1
2. Ration
The experimental and control &ets are given in Tables XI11 and
XIV. Table XI11 relates to the first 23 weeks. From week 24 through
week 41 the hay was decreased from 3.64 kg. a day to 2.73 kg. a day,
the wheat bran was increased from 2.73 kg. a day to 4.09 kg. a day, and
and the phosphorus supplementation was increased from 11.58 g. a day
to 23.16 g. a day. The calcium and phosphorus contents during the
experiment are summarized in Table XV.
Hy. Timothy hay with minor amounts of weeds and native
grasses was used. The hay was grown locally and field-cured 2 months
prior to the beginning of the experiment. Total protein, calcium, and
phosphorus were determined once from representative samples of 20
bales of hay.
Soft wheat bran and “Omolene” (Table XIV) were the grain pro-
ducts used in the ration for experimental and control horses, respec-
tively. Total protein, calcium, and phosphorus were determined once
from 18 bags of bran and 10 bags of “Omoleney’.
Water. The source of drinking water was the water supply of the
city of Ithaca, New York. The calcium content was checked twice.
Phosphoruf supplementation. Monosodium phosphate was given as a
supplemental phosphorus source to NSH 1, and the other NSH horses
were given disodium phosphate. The sodium phosphate was of a
technical grade. The supplement was dissolved in the drinking water
daily.
Sodium chloride was fed free choice from blocks in the stalls.
3. Physical Examination
The animals were observed daily, and routine physical examina-
tions were made at monthly intervals.
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