Figure 2 - Dose response of piglets fed different sources of zinc. ADG (g/day)
0.25 0.23 a 0.21 ab 0.19 0.17 0.15 b b 0 1 HiZox, Animine.
No response 300
600 900 Zn level (ppm) 1200 1500 1800 P <0.001 b ab
potentiated zinc1 ZnO
a a a a
Zinc deficiency can lead to a re- duction of feed intake.
Zinc source impacting birth weight In a second trial performed by Bologna University, Italy, the zinc source effect was evaluated on nursery pigs that were born with either low (0.92 kg) or normal (1.37 kg) birth weight. At weaning (25 days), those piglets had 6.3 kg and 7.8 kg for low and normal birth weight, respectively. Zinc was supplemented at 120 ppm from either ZnSO4 source or po- tentiated zinc. Piglets fed potentiated zinc displayed a signifi-
cantly improved faecal index compared to piglets fed ZnSO4 during the whole trial period (0–21 days) for both groups (low and normal birth weight) (see Figure 3). The ADG was also improved when the potentiated zinc was
supplemented. Even though those effects were observed in both groups, the improvement was more pronounced in low- weight piglets, demonstrating the ability of potentiated zinc to support the weak piglets’ gut function and to favour better group homogeneity.
Presenting new opportunities The ban of ZnO puts pressure on the industry to find solu- tions to deal with post-weaning diarrhoea. It also presents an opportunity to better understand the sources that have been used for decades and how doses can be optimised when using a potentiated zinc source.
Figure 3 - Faecal index of piglets fed different sources of zinc. On the left, the low-birth-weight group, on the right, piglets with normal birth weight. Faecal index (%)
Faecal index (%)
2.5 2.0 1.5 1.0 0.5 0.0
* ** ** d0-d9 LBW ZnSO4 HiZox, Animine. d0-d14 d0-d21 LBW potentiated zinc1
* P<0.05 ** P<0.01
2.0 1.5 1.0 0.5 0.0
d0-d9 NBW ZnSO4
Faecal index: Percentage of piglets with a faecal score higher than 3 (faecal score, ranging from 1 – hard faeces; to 5 – watery faeces). 1
d0-d14
d0-d21 NBW potentiated zinc1
▶ PIG PROGRESS | Volume 38, No. 3, 2022
55
PHOTO: HENK RISWICK
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