Body weight gain
The body weight gain values are presented in Table 2. There was significant difference (P<0.05) among the aloe vera group in comparison to other treatment groups throughout the experiment. The highest body weight gain was recorded in 4th week. The results revealed that body weight was significantly higher (P<0.05) in T
3 followed by T
2, T
1 and T
0 throughout the experimental trial. The bird under stress usually hampers the feed intake leading to less nutrition finally lead less body weight gain. Aloe vera herb rich in antioxidant and vitamins that enhance the body weight gain during stress condition in broilers
(Punetha et al., 2010). Mopuri and Islam (2017) also reported that the live weight gain and feed efficiency were significantly (P<0.05) better in the broilers provided water containing 15 ml/L aloe vera aqueous extract.
Sinurat et al., (2002) reported that feeding aloe vera gel either dry or fresh form increases the body weight.
Cahaner and Leenstra (1992) reported that heat stress reduces the body weight gain.
Feed intake
The result depicted in Table 3 shows that the first two weeks of age have no significant difference on feed intake, irrespective of different dietary treatments. But at 3
rd week feed intake was significantly higher (P<0.05) in T
2 (614.19), T
1 (615.36) than T
3 (586.78) and T
0 (577.03). However, at 5
th and 6
th week feed intake was statistically higher (P<0.05) in herbs supplementation groups in comparison to group which was not supplemented with herbs. Similarly
Singh et al., (2013) reported that feed intake in aloe vera supplemented group were more compared to the group which was not supplemented by aloe vera.
Singh et al., (2014) also stated that broilers treated with amla powder resulted in significant increase in feed intake. In contrary
Cerniglia et al., (1983) and
Boudreau and Beland (2006) revealed that supplementation of aloe vera had no effect on feed intake.
Kalam et al., (2010) reported that reduced feed intake at 34°C were 50% as compared to bird exposed to temperature 24°C during 2
nd and 4
th week of age.
Weekly water intake
The mean water intake (ml) depicted in Table 4, the data indicated that entire experimental trial had significantly higher value in T
0 (2045.30) followed by T
1 (1969.80) and T
2 (1942.30) with intermediate value for T
3 (1957.30 ml). The mean water intake (ml) in first week was significantly lower (P<0.05) in T
3 (400.32) than T
0 (419.24) and T
2 (412.54), with intermediate value for T
1 (410.63). The mean water intake (ml) at 6
th week was significantly higher in T
0 (4085.80) followed by T
1 (3981.70), but T
2 (3928.00) and T
3 (3944.70) has lowest water intake. During the entire trial, weekly water intake was found higher in T
0 in comparison to treatment groups, indicating that the birds were under stress condition. Similar findings also found by
Borges et al., (2007).
Feed conversion ratio
The data depicted in Table 5 indicated that there was no significance difference from 4
th week till 6
th week of FCR within the treatment group. The high significance difference was seen in control group compared to other herbal treated group. The better FCR was seen in aloe vera treated group followed by amla and rough lemon. Indicating the growth performance was desirable in group treated with aloe vera similar finding was also seen by
Brindha et al., (2017) where the aloe vera group revealed better FCR compared to other herbs under heat stress condition as they contain vitamin C, A and E which are main antioxidant vitamin that helps to alleviate heat stress condition. Similarly
Mandal et al., (2017) also reported amla fruit powder improved FCR during summer.
Sharma et al., (2015) reported that better feed conversion ratio was seen broiler treated with amla.
Demir et al., (2003) stated that herbal feed additives had better FCR compared to antibiotic treated groups.
Effect of herbal feed additives on mortality
Mortality pattern is presented in Table 5. There was less mortality observed in the broiler birds supplemented with herbs. Hence, it is predicted as supplementation of rough lemon, amla and aloe vera alleviates the heat stress in broiler.
Eevuri and Putturu (2013) also reported that less mortality was observed in broiler fed with herbal growth promoter containing. Mehala and Moorthy (2008) stated that 100% livability was observed with inclusion of aloe vera and curcuma longa and their combination in broiler diet.
Kumar et al., (2005) reported that mortality was reduced in birds supplemented with either amla fruit powder or its mixture with other herbs.
Herbal feed additives on economics of production
The net profit per bird (Rs.) for groups T
3 (47.41) followed by T
2 (45.64), T
1 (38.25) and T
0 (26.08) as depicted in Table 6. The results revealed even though the treatment group supplemented with aloe vera spare more the cost of production because of supplements addition in the rations of broilers. But high profit was shown in increasing order by amla, rough lemon and control. Similarly
Yadav et al., (2017) and have reported that aloe vera treated groups were found to be beneficial in terms of net profit. However,
Patel et al., (2016) revealed significant results which were similar to present findings.