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

100%

Stopa W. , Wróbel B. , Paszkiewicz-Jasińska A. , Zielewicz W.

Journal of Research and Applications in Agricultural Engineering

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2022

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tom Vol. 67, nr 2

39--44

EN

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.

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Evaluation of dry matter intake, average daily gain and faecal nitrogen excretion predicted by the Cornell Net Carbohydrate and Protein System with different beef cattle breeds fed in China

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Xie X. X. , Meng Q. X. , Ren L. P. , Du J. P. , Lin M.

Journal of Animal and Feed Sciences

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2013

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tom 22

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nr 4

EN

This study was conducted to evaluate the predictions of dry matter intake (DMI), average daily gain (ADG), and faecal nitrogen (N) excretion by the Cornell Net Carbohydrate and Protein System Version 6.1.26 (CNCPSv6) in China. A total of 71 bulls from two imported breeds, Limousin and Simmental, and three local breeds: Luxi, Jinnan and Qinchuan were selected in China. Data required by the CNCPSv6 model were collected, and model predictions were generated for animals of each breed. The regression equation between observed and predicted DMI for these cattle was: YOBS = 0.93XCNCPS + 0.48 (R2 = 0.94; P < 0.001), with an intercept not different from zero and a slope not different from unity. The proportion of deviation points lying within the range –0.4 to 0.4 kg · d–1 was 90.1%. The regression equation between observed and predicted ADG was: YOBS = 1.07XCNCPS – 0.05 (R2 = 0.92; P < 0.001), with an intercept not different from zero and a slope not different from unity. About 78.9% of points fell within the range –0.1 to 0.1 kg/d for these cattle. Model-predicted faecal N excretion for the cattle breeds was close to the observed values. The regression equation between observed and predicted faecal N excretion was: YOBS = 1.04XCNCPS – 1.48 (R2 = 0.94; P < 0.001), with an intercept not different from zero and a slope not different from unity. About 73.3% of the points fell within −4 and 4 g per day. These results show that the CNCPSv6 model using actual feed fractions can give good predictions of DMI, ADG and faecal N excretion with different beef cattle breeds in China.

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Plonowanie oraz względna wartość pokarmowa mieszanek Dactylis glomerata L. z Medicago Media Pers. w zależności od zróżnicowanego udziału lucerny w zasiewie

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Acta Agrophysica

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2017

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tom 24

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nr 3

PL

W eksperymencie oceniano wpływ zróżnicowanego udziału lucerny mieszańcowej (Medicago media Pers.) w mieszance z kupkówką pospolitą (Dactylis glomerata L.) na plonowanie oraz względną wartość pokarmową uzyskanej paszy. Oceny jakościowej paszy dokonano na podstawie zawartości włókna NDF (neutralne włókno detergentowe) i ADF (kwaśne włókno detergentowe), obliczając wskaźnik względnej wartości pokarmowej (RFV), który łączy strawność i pobranie paszy w jeden parametr, umożliwiający efektywną ocenę pasz objętościowych. Badania przeprowadzono w latach 2010-2012. Ścisłe doświadczenie polowe zlokalizowano w Stacji Dydaktyczno-Badawczej Uniwersytetu Warmińsko-Mazurskiego w Olsztynie, na glebie mineralnej, klasy bonitacyjnej IVa, kompleksu żytniego bardzo dobrego. Udział nasion lucerny w mieszance z kupkówką wynosił 30, 50 i 70% w stosunku do masy nasion gatunku wysiewanego w czystym siewie. Na obiektach kontrolnych wysiano w siewie jednogatunkowym: lucernę (100%) oraz kupkówkę (100%). Badania wykazały, że procentowy udział lucerny w plonie mieszanek różnił się do udziału wysianych nasion. W drugim roku badań stanowiła ona od 57 do 59% masy plonu. Plonowanie było zmienne w latach badań, w pierwszym roku pełnego użytkowania mieszanki oraz kupkówka w siewie czystym plonowały lepiej niż lucerna, natomiast w drugim roku najwyższy plon suchej masy uzyskano z mieszanki o 70% udziale nasion lucerny, zaś najniżej plonowała monokultura kupkówki pospolitej. Wprowadzenie lucerny mieszańcowej, jako komponentu mieszanki z kupkówką pospolitą, korzystnie wpłynęło na pobranie suchej masy przez zwierzęta oraz zwiększyło jej wartość pokarmową. Procentowy udział nasion lucerny w mieszance w niewielkim stopniu różnicował względną wartość pokarmową uzyskanej paszy.

EN

The aim of this study was to determine the effect of different proportions of Medicago media Pers. in mixtures with Dactylis glomerata L. on the yield and nutritional value of green fodder. Qualitative analysis of fodder included the determination of the concentrations of acid detergent fibre (ADF) and neutral detergent fibre (NDF), and the relative feed value (RFV) which combines feed intake with digestibility and supports an effective evaluation of roughage. A small-area field experiment was conducted in 2010-2012 at the Agricultural Experiment Station owned by the University of Warmia and Mazury in Olsztyn (Poland). The experiment was established on mineral soil of quality class IVa and very good rye complex. The percentage of alfalfa seeds in the mixture was 30, 50 and 70% relative to the total mass of seeds of pure-sown species. Control treatments were pure-sown alfalfa (100%) and pure-sown cocksfoot (100%). The research showed that the percentage of alfalfa in yield of the mixtures was different from the relative shares of sown seeds. In the second year of the study the percentage of alfalfa was from 57 to 59% of the mass of yield. Yielding was variable among the years of research. In the first year, mixtures and pure-sown cocksfoot gave better yield than alfalfa. During the second year, the highest dry matter yield was obtained from the mixture with 70% alfalfa seeds, while the yield of pure sown cocksfoot was the lowest. Introduction of hybrid alfalfa as a component of mixtures with cocksfoot had a beneficial effect on dry matter intake by animals and increased the nutritive value of the feed.. The percentage of alfalfa seeds in the mixture differentiated the relative nutritional value of obtained feed only to slight degree.

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Investigation of major gene for milk yield, milking speed, dry matter intake, and body weight in dairy cattle

67%

Karacaoren B. , Kadarmideen H. N. , Janss L. L. G.

Journal of Applied Genetics

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2006

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tom 47

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nr 4

EN

The main aim of this study was to determine if there exist any major gene for milk yield (MY), milking speed (MS), dry matter intake (DMI), and body weight (BW) recorded at various stages of lactation in first-lactation dairy cows (2543 observations from 320 cows) kept at the research farm of the Swiss Federal Institute of Technology between April 1994 and April 2004. Data were modelled based a simple repeatability covariance structure and analysed by using Bayesian segregation analyses. Gibbs sampling was used to make statistical inferences on posterior distributions; inferences were based on a single run of the Markov chain for each trait with 500 000 samples, with each 10th sample collected because of the high correlation among the samples. The posterior mean (±SD) of major gene variance was 2.61 (±2.46) for MY, 0.83 (±1.26) for MS, 4.37 (±2.34) for DMI, and 2056.43 (±665.67) for ВW. Highest posterior density regions for 3 of the 4 traits did not include 0 (except MS), which supported the evidence for major gene. With additional tests for agreement with Mendelian transmission probabilities, we could only confirm the existence of a major gene for MY, but not for MS, DMI, and BW. Expected Mendelian transmission probabilities and their model fits were also compared.