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The Effect of the Timing of Harvesting the First Regrowth of the Swardon Relative Feed Value

Stopa Wojciech, Wróbel Barbara, Paszkiewicz-Jasińska Anna, Zielewicz Waldemar

Journal of Research and Applications in Agricultural Engineering

2022

Vol. 67, nr 2

39--44

The timing of harvesting the first regrowth affects the quantity and quality of the harvested forage, induding fibre content Plant fibre is the building block of cell walls, ils components are cellulose, hemicellulose, lignin, undecomposed protein, pectin, water and ash. Its properties are intluenced by factors such as meteorological condilions in a given season, soil conditions and ferlilizalion, as well as the developmentał stage of the plants at the time of harvest. This paper presents the results of a three-year (2014-2016) study conducted on a three-cut permanent hay-meadow located on mineral soil. Mineral fertilization was carried out annually at the following rates: 60 kg·ha-1 N, 30 kg-ha-1 P and 60 kg-ha-1 K. Biomass sampies for testing were taken each year on five dates: April 28-30, May 5-7, May 11-14, May 18-21 and May 24-28. The content of ADF (acid detergent fibre), NDF (neutral detergent fibre), ADL (acid detergent lignin) was determined in the collected plant samples. Next, the effect of the dale of harvesting the first regrowth of the swardon the degree of lignification, dry matter digestibility (DDM), theoretical dry matter intake (DMI) and the relative feed value of the forage expressed by the RFV index was evaluated. The study found an effecel of the timing of harvesting the first regrowth of the sward on the parameters studied. The fibre fraction contents of NDF, ADF and ADL increased each year with the following dates, having an effect on reducing the relative feed value of plants.

Relative feed value of sward from permanent dry meadow before and after renovation at different fertilisation

Mendra M.

Journal of Research and Applications in Agricultural Engineering

2017

Vol. 62, nr 4

13--17

It is possible to obtain much wholesome bulk fodder that meets the requirements of highly productive animals from permanent grasslands of appropriate species composition. Important components of such fodder are: neutral detergent fibres (NDF) and acid detergent fibres (ADF). Based on their content one may calculate digestibility of dry mass (DDM), dry mass intake (DMI) and relative feed value (RFV). Presented studies were performed in the years 2009-2014 on five plots in a long-term experiment situated on a permanent dry ground meadow, that belonged to the Experimental Farm of the ITP in Falenty. In spring 2012 the meadow was renovated through undersowing. Mean values of analysed parameters were similar and more distinct differences were found between cuts and subsequent study years. Mean NDF content ranged between 501 and 567 g kg-1 while ADF content - between 265 and 325 g kg-1. Digestibility of analysed sward was lower than optimum and amounted from 60.1 do 63.6 % dry mass. Intake was assessed at 2.12 to 2.48%. Mean values of RFV were in the range of 100 to 120 which placed the fodder in the third and fourth quality class according to Linn and Martin [8].

Na trwałych użytków zielonych o odpowiednim składzie gatunkowym uzyskuje można uzyskać dużą ilość pełnowartościowych pasz objętościowych, spełniających wymogi wysoko produkcyjnych zwierząt. Ważnymi składnikami paszy są włókna neutralno detergentowego (NDF) oraz kwaśno-detergentowego (ADF). Na ich podstawie można wyliczyć strawność (DDM), pobieranie suchej masy (DMI) oraz względna wartość pokarmową (RFV). Omawiane badania prowadzono na pięciu obiektach w latach 2009-2014 na długoletnim doświadczeni zlokalizowanym na łące trwałej gradowej należącej do ZD ITP w Falentach. Wiosną 2012 r. przeprowadzono renowację łąki metodą podsiewu. Średnie wartości badanych parametrów na poszczególnych obiektach były na zbliżonym poziomie, a wyraźniejsze różnice stwierdzono miedzy pokosami oraz kolejnymi latami badań. Średnia zawartość NDF wynosiła od 501-567 g kg-1, natomiast ADF od 265 do 325 g kg-1. Strawność badanej runi była niższa od optymalnej i wynosiła 60,1 do 63,6 % s.m.. Pobierania wyliczono na 2,12 do 2,48 %. Średnie wartości RFV mieściły się w zakresie od 100 do 120, co plasowało ją w III i IV klasie jakości według Linna i Martina [8].