• Energy Research

When feeding pregnant sows, optimal body condition at birth is sought to avoid the effects of a deviant nutritional condition on health and performance. Various feeding concepts exist but mainly have a restriction in quantity and renunciation of farm-grown forage in common. An ad libitum liquid feeding system based on farm-grown forage in combination with a sow sorting gate (according to body weight—using mechanical scales) was realized on a commercial swine farm. The sorting gate coordinated access to two feeding areas with rations based on whole plant wheat-silage (WPWS) differing in energy content. In this study with a total of 183 pregnant sows, effects of restrictive dry feeding (System I) were compared with ad libitum liquid feeding based on farm-grown forage (System II). Sows were monitored regarding body condition development during pregnancy by measuring body condition score (BCS), body weight (BW), and back fat thickness (BFT) on different time points. Sow and piglet health (vaginal injuries of sows, rectal temperature during the peripartal period, vitality of newborn piglets) and performance data regarding litter characteristics were also recorded. Body condition development of the sows was absolutely comparable. Performance indicators and the course of birth were also similar but with significantly higher scores for piglet vitality in System II (p < 0.05). The tested concept offers opportunities for more animal welfare and sustainability but remains to be further investigated regarding the repertoire of possibly applied farm-grown forage and the effects of the concept in the transit phase of sows.

A sustainable increase in livestock productivity cannot be achieved without the use of sustainable animal feed. Due to the growing awareness of the long-term benefits of sustainability, there is an increasing interest in replacing traditional feed resources with the most sustainable feedstuffs in pig production. Rye production is relatively sustainable compared to wheat. This farm study investigated whether the newborn body weight as well as antibody transfer in piglets (serum immunoglobulin immunocrit) are affected by feeding rye instead of wheat grain to transition sows. A total of 237 sows and their piglets (n = 711) from three farms located in northern Germany participated in this study. During the transition period, the sows were fed either a wheat-based diet used as the control diet (CON) or a 30% rye diet (RYE) for 7 days before the calculated farrowing date. On the day of farrowing, piglet body weights within 24 h post-natal (PN) were recorded, and blood samples were taken from the lightest, medium, and heaviest piglets in each litter to determine the quantification of immunoglobulins in the piglets. Feeding rye-based diets to the sows showed no differences in the body weight of the newborns (within 24 h) compared to the CON group in all body weight categories, except on Farm C in light and medium piglets, where high BW were observed in the CON group. The immunocrit ratio did not show any differences between both feeding groups. A relationship between newborn body weight and immunocrit ratios in the CON and the RYE groups was observed only on farm A. Overall, this study showed that including amounts of rye up to 30% in sows’ diets during the transition period had no negative effects on newborn piglet body weight or on antibody transfer and therefore can be considered an adequate replacement for wheat (up to 30%) in diets for transition sows. However, future research is needed to determine whether a higher proportion of rye may be used.

Monitoring of sows’ health is the key to preventing and controlling diseases in sows, and it guarantees optimal rearing conditions for piglets. The aim of this study was to investigate the relationship between the health status of sows shortly after parturition, and to analyze thermographic images of the mammary gland and the sows’ performance. Clinical examination of a total of 513 db.Viktoria hybrid sows was bundled individually using a modified score system. According to this, animals were divided into three health classes: healthy, clinically suspicious, and diseased. Simultaneously, the mammary glands were investigated by infrared thermography. Total born piglets (TBP), number of piglets born alive (NBA), and the daily weight gain of the piglets were significantly lower in the diseased group (p < 0.05). Regarding the results of the thermographic images of the mammary gland, significantly higher mean value of the warmest pixels was found in the diseased group (38.3 °C ± 0.57), while the significantly lowest value was reported in the healthy group (37.2 °C ± 0.54; p < 0.05). The results of this study show that thermography of the mammary gland at birth contains information that can help to identify diseased animals whose disease has negative effects on their piglets.