Probiotics are used in all stages of pig production: sow herd, nursery and growing-finishing pigs. Generally speaking, the use of probiotics aims to establish a healthy gut microbiota, improve health, well-being and productivity of the animals (Cho et al. 2011). However, if we are more specific, the practical application (or result) of using probiotics can be distinct in every context

benefits of probiotics to the sow herd
• Reduction of clinical signs of the uterus and/or udder disease
• Increase feed consumption during last pregnancy stages or lactation
• Improvement of body condition at the end of lactation
• Reduction of the weaning–estrus interval due to energy mobilization
• Improvement of colostrum quality, milk quality and quantity
• Reduction of gut pathogens in sows and/or piglets
• Modulation of litter immunity
• Enhancement of litter size
• Enhancement of growth rates of the piglets
• Reduction of clinical signs of diarrhea in piglets
• Delivery of probiotics to piglets
• Modulation of stress response

benefits of probiotic in nursery
• Modulation of piglet’s gut microbiota
• Protection against pathogenic bacteria, gastrointestinal disorders and diarrhea
• Enhancement of intestinal barrier function
• Modulation of immunity
• Improvement of digestibility, enhanced growth and feed conversion ratio
• Improvement of productive parameters in piglets
• Supplementation of targeted nutrients

benefits of probiotics to fattening pigs
• Improvement of meat quality
• Improvement of digestibility
• Reduction of contamination by decreasing fecal NH3- N
• Reduction of subclinical pathogenic infections or zoonoses
• Reduction of mortality
• Improvement of weight gain
• Improvement of gut health

Sow herd and piglets
Administering probiotic treatments to sows has demonstrated a dual potential, including benefits for themselves and for piglets. Supplementation of sows with probiotics may increase feed consumption during late pregnancy stages or lactation, improving body condition at the end of lactation (Bohmer et al. 2006). This situation is desirable, because it can cause a reduction of the necessity of energy mobilization at lactation. This, in turn, could be the explanation of the reduction in the weaning–estrus interval that has also been reported with probiotics (Hayakawa et al. 2016). Reproductive-performance-related benefits have also been reported with the use of probiotics in sows. For example, an increase in the number of piglets (Apic et al. 2014) or higher piglet growth rates with greater body weight at weaning (Alexopoulos et al. 2004). Furthermore, a reduction of gut pathogens (Kritas et al. 2015), clinical signs of uterus and/or udder disease (Apic et al. 2014), together with fewer clinical signs of diarrhea in piglets (Taras et al. 2006) have also been described. Finally, there is an ongoing scientific interest to assess the capacity of sows to deliver probiotics to piglets in early-life stages (Scharek-Tedin et al. 2015).

Nursery piglets
Up until today, the nursery period is where the use of probiotics is receiving more interest in swine production, with the aim to improve weaning outcome (de Lange et al. 2010). Weanling piglets have low disease resistance, which makes them vulnerable to stress reactions and invasion by pathogenic microorganisms (Konstantinov et al., 2006). This can be a serious problem, as this period is considered critical in terms of productivity, because performance parameters at the first week post-weaning can be correlated to subsequent performance of the pigs up to the market weight (Kats et al., 1992).
Probiotics can potentially act beneficially in these animals in several ways. For instance, it has been reported that supplementing weanlings with probiotics may prevent or improve diarrhea (Bhandari et al. 2008), re-establish microbial balance after a transient drop in favorable bacteria (Krause et al. 2010), protect against pathogenic bacteria (Casey et al. 2007), enhance intestinal barrier function (Guerra-Ordaz et al. 2014) and stimulate immunity (Lessard et al. 2009). As a consequence of one or a combination of the before-mentioned reasons, probiotics have been reported to improve productive parameters of post-weaning piglets in many occasions (Ahmed et al. 2014, Bhandari et al. 2010).

Fattening pigs
The main objective to use probiotics in this phase would be to enhance productivity. Scientific literature published until now would support the idea that although older pigs have more developed immunity, and capacity to resist intestinal disorders, there is still a margin for probiotics to act and potentiate growth; especially in early growing phases or high-density diets (Meng et al. 2010). Improvement of the final meat quality and organoleptic properties could also be another target for probiotics in this phase, as probiotics have been described to affect meat color, marbling and firmness scores (Černauskienė et al., 2011); and reduce potentially zoonotic infections such as Salmonella spp. (Casey et al., 2007). Finally, a weakly explored but interesting potential of probiotics is to reduce environmental pollutants from animal manure. Several probiotics have been reported to be capable of reducing potential pollutants from manure such as fecal noxious gas (H2S) or ammonia (NH3) content, particularly in pigs fed high-nutrient density diets (Yan and Kim, 2013). The direct mechanisms for these effects are still unknown, although indirect mechanisms such as improving feed efficiency, nutrient retention and modulation of gut microbiota are probably involved.
Support sow longevity with probiotics
Optimal body condition score at the end of the lactation period positively influences the longevity of the sows. Use of dietary probiotics has proven to reduce weight losses during the lactation period and as a result, improve sow fertility. Additionally, probiotics are able to increase piglet weaning weight. Therefore, probiotics seem to be a very promising feed strategy for sustainable pig production.

With increasing numbers of piglets born, the energy requirements for milk production of prolific sows simultaneously increases. Feed intake during the lactation period is often not sufficient to fulfil all the requirements for the high milk production. As a consequence the sow will use her own body reserves which can lead to serious body condition losses during lactation. An important concern of this negative energy balance is the adverse effect on reproductive performance and productivity in the next cycle. Especially gilts, who have not reached their mature body weight yet, and lean dam lines are sensitive for detrimental body weight losses. As a result, sows are often culled before their third or fourth parity which is before the time at which the sow reached her maximum productivity and her replacement costs are covered.

Use of dietary probiotics could be part of the solution to improve sow longevity, from an economic, health and welfare point of view. Photo: Shutterstock
It is estimated that every kg body weight lost during lactation has to be compensated by an additional amount of 4kg feed in the next gestation period. Based on this estimation, a loss of body weight of 15kg requires an additional amount of 60kg gestation feed in the next cycle only for recovery. From a financial point of view and for better life time performance of the sow, it is clear that body weight losses during lactation should be limited as much as possible

My probiotic saturated and multiplication water which i use to mix the feed of my pigs to have the probiotic advantage. it is part of what i teach in the profitable pig production masterclass in addition to many e-books on pig production.

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