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Institute
- Fakultät AuL (125)
Zu viel Wasser in der TMR?
(2021)
Wirkung eines Vitamin D3-Metaboliten (25-OH-D3) auf den Geburtsverlauf von hochleistenden Sauen
(2022)
Wieviel Wasser säuft die Sau
(2022)
Weniger ist nicht immer mehr
(2022)
Weide für Trockensteher?
(2023)
Wasser dosiert zusetzen
(2021)
Wasser
(2021)
Vitamin D für starke Beine
(2023)
Lahmheiten bilden bei Sauen und wachsenden Schweinen ein ernstzunehmendes Gesundheits- und Tierwohlproblem. Die Studie zeigte, dass der diätetische Einsatz von 25-Hydroxycholecalciferol im Austausch zum Vitamin D3 zu einer Reduktion von Bewegungsproblemen bei Sauen und wachsenden Schweinen geführt hat.
Ursachen von Kotwasser
(2021)
Die Fütterung von Zuchtstuten ist ein wichtiger Faktor, der für die Geburt eines gesunden und voll entwickelten Fohlens und für die Fruchtbarkeit der Stute verantwortlich ist. Die Versorgung der Stuten ist aufgrund der Schwankungen in der Futteraufnahme rund um die Geburt durch den Einsatz von hochwertigen Futtermitteln zu sichern.
Die bedarfsgerechte Versorgung von Legehennen mit Futterstruktur und Aminosäuren ist essentiell. Die Studie zeigte, dass auf Praxisbetrieben im ökologischen Landbau sowohl Abweichungen von den Bedarfswerten als auch Veränderungen der Futterzusammensetzungen im Verlauf von der Herstellung bis zum Trog vorlagen.
Der Versuch überprüfte den Einfluss der Fütterung von Shredlage-Maissilage auf die Futterqualität, Mastleistung, Gesundheit und den Schlachtkörperwert von Fleckviehbullen. Die Ergebnisse zeigten, dass die Fütterung von Shredlage keinen negativen Einfluss auf die obigen Parameter ausübte. Im Gegenteil, der Einsatz von Shredlage zeigt Potential einen Beitrag zu einer wiederkäuergerechten Fütterung zu leisten und Produktionsmerkmale zu verbessern.
Shredlage in der Bullenmast?
(2021)
Shredlage in der Bullenmast
(2021)
Shredlage für Masttiere?
(2022)
Shredlage für Mastbullen?
(2021)
In a protein reduction feeding trial (Study 1) on a commercial broiler farm in northern Germany, it was attempted to be shown that research results from station tests on protein reduction can be transferred to agricultural practice. In a second study, the limits of the N reduction were tested in a research facility. In Study 1, commercial standard feeds were fed to the control group (variant 1:210,000 animals; n = 5 barns). In the test group (variant 2:210,000 animals; n = 5 barns), the weighted mean crude protein (CP) content was moderately reduced by 0.3%. The nitrogen reduction in the feed did not affect performance (feed intake (FA), daily gain (DG), feed conversion (FCR)), but nitrogen conversion rate increased from approx. 61% to approx. 63%. The solid litter weight was reduced by 12% and nitrogen excretion by 9% (p < 0.05). Significantly healthier footpads were due to lower water intake (−4%; p < 0.05) and a numerically drier bedding. In Study 2, responses of treatments (1250 broiler per variant; n = 5) showed that sharper N-lowering (−1.5% CP; weighted average) did not impair performance either, but N-conversion improved and N-excretions decreased significantly. Converted to a protein reduction of one percentage point, the N excretions were able to be reduced by 22% in Study 1 and 18% in Study 2. Feeding trials in the commercial sector, such as the present Study 1, should convince feed mills and farmers to allow the latest scientific results to be used directly and comprehensively in commercial ration design.
A project was initiated to apply dietary CP reduction under commercial conditions. The main objective was to demonstrate and validate that dietary CP can be reduced without compromising broiler performance in a production system which is already rather efficient. In addition, we wanted to demonstrate the potential of dietary CP reduction on reducing N-excretions especially in the context of German revised regulations and monitoring attempts. Finally, as previous research suggested, few further aspects such as impact of dietary CP reduction on litter quality and quantity, footpad health, change of ingredient inclusion levels and related impact on sustainability impact factors were evaluated.
Duckweeds are fast-growing and nutritious plants, which are gaining increased attention in different fields of application. Especially for animal nutrition, alternative protein sources are needed to substitute soybean meal. The current bottleneck is the standardized production of biomass, which yields stable quantities of a defined product quality. To solve this problem, an indoor vertical farm (IVF) for duckweed biomass production was developed. It consists of nine vertically stacked basins with a total production area of 25.5 m2. The nutrient solution, a modified N-medium, re-circulated within the IVF with a maximum flow rate of 10 L min−1. Nutrients were automatically added based on electrical conductivity. In contrast, ammonium was continuously supplied. A water temperature of 23 °C and a light intensity of 105 μmol m−2 s−1 with a photoperiod of 12:12 h were applied. During a 40-day production phase, a total of 35.6 kg of fresh duckweed biomass (equals 2.1 kg of dried product) was harvested from the IVF. On average, 0.9 kg day−1 of fresh biomass was produced. The dried product contained 32% crude protein (CP) and high levels of proteinogenic amino acids (e.g. lysine: 5.42 g, threonine: 3.85 g and leucine: 7.59 g/100 g CP). Biomass of this quality could be used as a protein feed alternative to soybean meal. The described IVF represents a modular model system for duckweed biomass production in a controlled environment and further innovations and upscaling processes.
Complete diets for laying hens are usually offered in meal form. This form initially promotes the laying hens’ natural feed intake behavior and allows them to satisfy their pecking behavior. At the same time, it can also cause difficulties, because it consists of different particles and is not a homogeneous unit. A homogeneous mixture is essential to ensure that each laying hen in the flock can meet its nutritional needs. If feed exhibits a wide particle size distribution, this can promote feed segregation during transport and selective feed intake behavior of laying hens. These two processes sometimes lead to significant differences between the composition of the feed produced and the composition of the feed that is finally ingested by the laying hens. Multi-stage sampling can be used to investigate progressing differences in feed composition. In this study, samples of different complete diets for laying hens (n = 76) were collected from ten organic farms in Germany to examine their particle size distributions (dry sieve analysis). Samples were taken at four different locations (V1 = loading, V2 = silo, V3 = at the beginning of the feed chain, V4 = at the end of the feed chain) in each farm. There was a tendency for V1 and V2 to be characterized by high proportions of particles between 1400 and 3150 µm (V1 = 61.2%, V2 = 43.5%). V3 and V4 consisted mainly of particles of size 500–800 µm and 200–400 µm, respectively. The lowest proportions across all variants were in the range above 3150 µm (V1 = 2.20%, V2 = 1.30%, V3 = 1.00%, V4 = 0.400%) and between 400 and 500 µm (V1 = 2.50%, V2 = 4.50%, V3 = 5.70%, V4 = 6.60%). The mean value comparison of the proportions of sieve mesh sizes from 200 to 1000 µm resulted in: V1 < V2 < V3 < V4; and of sieve mesh sizes between 1400 and 2000 µm in: V1 > V2 > V3 > V4. This observation can be explained by segregation of the feed during transport and a selective feeding behavior of the laying hens. However, trends were discontinuous and varied between the farms. Deviations from the guideline values were found in particular for particle sizes in the range of 1000 to 1400 µm.
Piglets experience a high level of stress during the onset of the fattening phase due to changes in social structures and feeding. Incorporation of flavors in the feed supports constant levels of feed intake thus avoiding drops in performance. This study aimed to evaluate if a combination of vanilla and fruity flavors could maintain high interest in variable feeds across different ages. 384 crossbred (Topigs 20 x Piétrain) piglets were separated at weaning into two groups (eight pens per group: four pens with females and four pens with uncastrated males; 24 animals per pen), according to gender and weight. The control group received commercial starter feeds without flavor, while the other group received diets with added flavor (500 g/t Cuxarom Fruit 210, a sweetish, berry multifruit note combined with creamy vanilla). After 49 days, 264 animals from both groups were rehoused and given an early-grower feed with or without added flavor for 7 days. Consequently, animals from the trial group again received flavor-supplemented feed and vice versa. During the early-grower phase, the feed intake of the trial group was 11.2% higher than that of the control group. Moreover, the trial group gained significantly more weight during the early-grower phase (+12.2%) in comparison to the control group. This indicates that the animals prefer the flavor they were familiarized with during the starter phase. This memory effect leads to an increased feed intake and weight gain in early-grower pigs and can counteract drops in performance, particularly when mixing animals or transitioning.
Duckweed is gaining attention in animal nutrition and is considered as a potential alternative protein source for broiler chickens. In order to evaluate the nutritional value of duckweed, three individual batches were investigated. They consisted of a mixture of Lemna minuta and Lemna minor (A, 17.5% crude protein), Spirodela polyrhiza (B, 24.6% crude protein) and Lemna obscura (C, 37.0% crude protein). Treatment diets contained 50% batch A, 50% batch B, and 25, 50 and 75% of batch C. All diets were fed to broiler chickens (Ross 308) from an age of 21 to 27 days. Diets with a share of 50 and 75% of batch C led to decreased feed intake (109.3 and 74.9 g/day, respectively) compared to the control. Standardized ileal digestibility of crude protein and amino acids differed significantly between duckweed batches, at values for methionine between 49.9 and 90.4%. For all amino acids, batch A consistently had the lowest and batch C the highest digestibility. Batches had different tannin contents of 2943, 2890 and 303 mg/kg for batches A, B and C, respectively. The apparent ileal digestibility of phosphorus differed significantly between all batches (50.8–78.9%). Duckweed can be used as a protein feed for broiler chickens. However, a defined and stable biomass composition optimized for the requirements of broiler chickens is needed.