Figure 3 - Dose dependant increases in sow ADFI in sows are seen when using a palatability enhancer.
PE 500 6.60c
PE 250
5.08a
6.02c
Control 0.00 1.00 2.00
ADFI (kg/day) 4.00
3.00
RUMINANT SOLUTIONS Cattle have difficulty in dissipating their heat loads efficiently, as they do not sweat and rely on respiration to cool down. The fermentation process that takes place in the rumen generates additional heat, accumulating during the day, it is then dissi- pated at night when it is cooler. When the environment at night is insufficiently cool, the animal accumulates heat that it cannot release, resulting in heat stress. Heat stress affects the health and welfare of herds, as well as performance leading to economic losses. High temperatures have a direct and negative effect on milk yield, due to a decrease in feed intake. Trials with the palatability enhancer Gusti Plus have recorded increases in dry matter intake and daily milk yield. In a trial comparing the performance of heat stressed dairy cattle supplemented with OH-SeMet (Selisseo) or sodium selenite (SS); milk yield tended to be higher in cows fed OH-Se Met (Figure 1).
POULTRY SOLUTIONS Heat stress has negative effects on broiler production in terms of ADG, feed efficiency, liveability, meat yield and quality. For laying hens, egg production and quality are also reduced, whilst in breeding birds, fertility and hatchability are affected. Methionine in the form of HMTBA, through its higher trans-sul- phuration potential and glutathione production, improves re- dox status and is complementary to the antioxidant properties of OH-SeMet helping poultry to better cope with heat stress.
Evidence in broilers The effect of OH-SeMet supplementation on growth performance of broilers exposed to heat stress have been evaluated in several trials using different broiler genetics and under various heat stress conditions. In those trials, compared to sodium selenite, OH-SeMet improved the antioxidant status of the birds resulting on average in about 30 g final body weight
5.08a 5.00 6.00 7.00
improvement, a 2% lowering in FCR and about 2 point less in mortality rate. A trial in Thailand showed improvement in FCR of those broilers fed HMTBA (Rhodimet). Researchers in Brazil saw a numerical improvement of BWG (+63g) and significantly lowering FCR (0.9 pts) in broilers fed HMTBA (Figure 2).
SWINE SOLUTIONS Enhancing the palatability of diets improves sow performance and optimises the value of lactation diets. The application of a palatability enhancer (PE) (Krave), in a tropical climate condi- tions, at 500 g/t, increased ADFI by 29% compared to control group and by 9.6% compared to PE at 250 g/t (Figure 3). Sows fed the higher inclusion level had increased average daily milk production,11% and 51% higher respectively, when compared to the lower level or the negative control group. These improve- ments resulted in higher daily litter weight gain and weaning lit- ter size. Daily litter weight gain in litters from sows fed 500 g/t PE was 23% and 31% higher compared to 250 g/t and the negative control groups, respectively. This observation is a consequence of the increase in sows’ ADFI and milk production, improving piglet weight gain. Dietary methionine level is also a subject worth ex- ploring in hot conditions. In trials, heat stressed swine fed HMTBA had a greater loin depth, compared to DL-Met.
Support for heat stress Using palatability enhancers to support feed intake helps ensure the performance of livestock and their offspring. Antioxidant capacity defines the ability of an animal to withstand heat stress. Supplementing animals with OH-SeMet, vitamins E and C – supports this. Using complementary nutritional strategies, including HMTBA, livestock are able to deal with unwanted metabolic consequences. In this way growth, efficiency, fertility, milk production, immunity, meat and egg quality are optimised.
▶ HEAT STRESS | MAY 2021
Contact: Adisseo. team@adisseo. com for more information
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