MVSc

An investigation was carried out to study the environment
variables and the effect of modified housing conditions on the
physiological norms and growth performance. during the dry
season on the large white Yorkshire grower pigs. The modified
housing include, Tl - without wallow and sprinkler, T2 - with
wallow only, T3 - with sprinkler only and T4 - with wallow and
sprinkler as the four treatment groups.
The dry season (summer) characterised by higher ambient
temperature (maximum temperature - 31.5° to 37°C, m: _ "_LllUm
temperature 22.8 to 26.1 °C, mean temperature 27.4°C ._0
31.3°C), comparatively lower relative humidity (mean RH 63.15
to 75.68%) and wind speed (2.75 to 7.8 km/h). The b'~gher
range of temperature was sufficient to cause stress OH the
performance of the grower pigs as per the literatures.
The treatment (T1) without wallow and sprinkler varies
significantly (P rate, cardiac rate both in the forenoon and afternoon from the
T2, T3 and T4 groups, i. e., Tl has shown more of phys Lo Lc g i.ca L
stress reaction than other treatment groups. T4 was fo' n~ to
be mo re : comfortable than T1• T2 and T3 were hav:'. 9 no
significant difference except in afternoon body temper ture
and respiration rate.





There were no statistically significant



(P<0.05)



difference between treatment groups in the fortnightly body

weight gain from the first fortnight to upto twelfth



'"
fortnight.


The twelfth fortnight body weight of the



treatments Tl, T2, T3 and T4 were 70.833 ± 2.114, 69.333 ±

5.816, 73.333 ± 5.681 and 71.667 ± 5.975. There were also no

significant difference in the body length, chest girth and
body height among the treatment groups in the fortnightly

observations. Though Tl had shown significant (P<0.05) rise
of physiological norms that had not reached upto the level of

growth retardation.

The overall fortnightly rate of gain (kg) and average

daily gain (g) of the treatment groups of Tl, T2, T3 and T4

were 5.08 ± 0.60, 4.97 ± 0.54, 5.28 ± 0.56 and 5.17 ± 0.60 and
339 ± 39. 9 , 330 . 9 ± 36. I, 351 . 7 ± 37. 6 and 343. 9 ± 36. 0 .

Under restricted feeding regime, T3 was having relatively

better feed conversion efficiency and lower cost per kg of



live weight pr'oduct.Lon than T4, Tl and T2•



The convers ion




efficiency of Tl, T2, T3 and T4 were 4.05, 4.15, 3.91 and 3.99

and cost per kg of live weight production 36.16, 37.03, 35.05

and 35.81.

Based on the observations and the results suitable method

of environment modification during the dry season for grower
pigs can be recommended.