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Water needs can vary considerably depending on the animal's physiological state, rearing environment and diet. Besides, a consumption-based approach to the water requirements of pigs may not be accurate due to inevitable waste. Theoretically, liquid-fed pigs should not require any additional source of water given that their water requirements are satisfied through liquid feed, and this is assumed for the traditional 3:1 water-to-feed ratio. However, there are many unpredictable circumstances under which water requirements increase, and in these situations pigs can benefit from additional drinking water. On the other hand, reducing water waste, and therefore the total volume of manure produced, is essential to lower the environmental impact. The aim of this trial was to verify whether the absence of additional fresh drinking water could compromise the production traits or behaviour of liquid-fed heavy pigs. Sixty animals (initial BW 78 kg) were divided into two experimental groups; both fed a liquid diet (water-to-feed ratio 3:1 w/w). All pens were equipped with nipple drinkers; one of the groups had permanent access to fresh water (working drinkers—WD), whereas the other group had no water supply except that delivered with food (dry drinkers—DD). The pigs were housed in temperature- and humidity-controlled rooms. They were brought to a weight of 160 kg and then slaughtered. Hams were dry-cured according to the directives for Parma ham production.
No significant differences (P>0.05) were observed between the experimental groups with respect to growth parameters (ADG and FCR), behavioural traits, blood parameters or the qualitative traits of carcasses (dressing out, lean meat yield, backfat thickness), meat (pH, colour, WHC, fatty acid composition of subcutaneous fat and tenderness) and cured hams (weight losses, sensory properties, chemical composition and oxidative status). With respect to drinking behaviour, a low number of visits to the drinker were recorded for both groups and data seem to indicate a high amount of water wasted by pigs provided with additional water delivery by nipple drinkers. Liquid feeding did not suppress drinkers use or drinkers manipulation in both groups.
Nannoni, E., Martelli, G., Cecchini, M., Vignola, G., Giammarco, M., Zaghini, G., & Sardi, L. (2013). Water requirements of liquid-fed heavy pigs: Effect of water restriction on growth traits, animal welfare and meat and ham quality. Livestock Science, 151(1), 21-28. http://dx.doi.org/10.1016/j.livsci.2012.10.005