Physical Sciences and Mathematics Commons^™

Modelling The Effect Of Breakeven Date In Spring Rotation Planner On Production And Profit Of A Pasture-Based Dairy System, P. C. Beukes, B. S. Thorrold, M. E. Wastney, C. C. Palliser, G. Levy, X. Chardon

IGC Proceedings (1997-2023)

The breakeven date is the expected date when pasture supply exceeds cow demand. This date is used to plan the rotation rates, slow during the winter, when pasture growth is low and cows are dry, to a fast rotation in spring, when growth is accelerating and most cows lactating. This date is influenced by regional climate, mainly rainfall and soil temperature, which affects timing and rate of growth acceleration. The objective of this modeling exercise was to explore the effect of the breakeven date on milksolids (MS), grass silage, farm cover and economic farm surplus (EFS) over different climate years …

Moisture Control, Inoculant And Particle Size In Tropical Grass Silages, S. F. Paziani, L. G. Nussio, D. R. S. Loures, L. J. Mari, José Leonardo Ribeiro, P. Schmidt, M. Zopollatto, M. C. Junqueira, A. F. Pedroso

IGC Proceedings (1997-2023)

Decreased fermentation and spoilage losses with improved aerobic stability during feed out can be accomplished by several strategies, such as wilting, addition of microbial additives and moisture absorbents. Particle size reduction may increase bulk density and improve the fermentation. The objective of this trial was to evaluate the effects of particle size, moisture content and a microbial additive on chemical-physical parameters and losses in silages made from Tanzania grass.

Effects Of Supplementary Concentrate Level And Separate Or Mixed Feeding Of Grass Silage And Concentrates On Carcass Tissue Colour Traits In Steers, J. Caplis, M. G. Keane, A. P. Moloney, F. P. O'Mara

IGC Proceedings (1997-2023)

The level of supplementary concentrates fed with grass silage and the method of feeding (separate or mixed) may affect carcass tissue colour in steers. The objectives were to determine the effects of (1) supplementary concentrate level with grass silage, and (2) separate or mixed feeding of silage and concentrates, on muscle and fat colour.

Effects Of Supplementary Concentrate Level And Separate Or Mixed Feeding Of Grass Silage And Concentrates On Carcass Tissue Composition In Steers, J. Caplis, M. G. Keane, F. P. O'Mara

IGC Proceedings (1997-2023)

Supplementary concentrate level may affect carcass composition in steers. Feeder wagons facilitate feeding and management. The objectives were to determine the effects of (1) supplementary concentrate level with grass silage, and (2) separate or mixed feeding of silage and concentrates, on ribs joint composition.

Grass Silage: Factors Affecting Efficiency Of N Utilisation In Milk Production, P. Huhtanen, K. J. Shingfield

IGC Proceedings (1997-2023)

Key points

1. Low efficiency of N utilisation for milk production in cows fed grass silage-based diets is mainly due to excessive N losses in the rumen.
2. The type and extent of in silo fermentation can alter the balance of absorbed nutrients.
3. There is very little experimental evidence that the capture of N in the rumen can be improved by a better synchrony between energy and N release in the rumen. Nitrogen losses in the rumen can be reduced by decreasing the ratio between rumen degradable N and fermentable energy.
4. Rapeseed meal has increased milk protein output more than isonitrogenous soybean …

Prediction Of Indigestible Ndf Content Of Grass And Legume Silages By Nirs, L. Nyholm, M. Rinne, M. Hellämäki, P. Huhtanen, J. Nousiainen

IGC Proceedings (1997-2023)

The future feed evaluation systems based on mechanistic digestion models require reliable estimates of forage digestible and indigestible NDF content (DNDF and INDF). The objective of this study was to examine the potential of near infrared reflectance spectroscopy (NIRS) in predicting INDF content of grass and legume silages.

Modelling The Effect Of Breakeven Date In Spring Rotation Planner On Production And Profit Of A Pasture-Based Dairy System, P. C. Beukes, B. S. Thorrold, M. E. Wastney, C. C. Palliser, G. Levy, X. Chardon

IGC Proceedings (1997-2023)

The breakeven date is the expected date when pasture supply exceeds cow demand. This date is used to plan the rotation rates, slow during the winter, when pasture growth is low and cows are dry, to a fast rotation in spring, when growth is accelerating and most cows lactating. This date is influenced by regional climate, mainly rainfall and soil temperature, which affects timing and rate of growth acceleration. The objective of this modeling exercise was to explore the effect of the breakeven date on milksolids (MS), grass silage, farm cover and economic farm surplus (EFS) over different climate years …

Hygienic Value And Mycotoxins Level Of Grass Silage In Bales For Horses, A. Potkański, J. Grajewski, K. Raczkowska-Werwińska, B. Miklaszewska, A. Gubała, M. Selwet, M. Szumacher-Strabel

IGC Proceedings (1997-2023)

Mycotoxins are secondary metabolites of moulds which have adverse effects on humans, animals, and crops and result in illnesses and economic losses. The toxins may occur in storage under conditions favourable for the growth of the toxin-producing fungus or fungi. The highest forage concentration of toxins was found in horizontal storage methods such as bunker silos and feed piles, which were left open to oxygen. In any fermentation storage system, temperature and the presence of moisture is sufficient for toxin production. In a plastic covered storage system, oxygen penetration is slowed but not eliminated. The longer silage is stored, the …

The Effect Of Dry Matter Content And Inoculation With Lactic Acid Bacteria On The Residual Water Soluble Carbohydrate Content Of Silages Prepared From A High Sugar Grass Cultivar, D. R. Davies, D. K. Leemans, E. L. Bakewell, R. J. Merry

IGC Proceedings (1997-2023)

The introduction of new perennial ryegrass cultivars bred for high water soluble carbohydrate (WSC) content has created opportunities for improving the quality of grass silage, by not only providing adequate WSC for a good fermentation, but also sufficient to leave a higher residual level of WSC in the mature silage. High WSC silages have the potential to provide readily available energy during the early stages of rumen fermentation to balance energy and nitrogen supply and optimise rumen microbial growth. (Merry et al. 2002). The aim was to examine the effect of wilting and silage inoculants on the residual WSC content …

An Evaluation Of Grain Processing And Storage Method, And Feed Level On The Performance And Meat Quality Of Beef Cattle Offered Two Contrasting Grass Silages, T. W. J. Keady, F. O. Lively, D. J. Kilpatrick

IGC Proceedings (1997-2023)

Traditionally cereals have been dried or treated with propionic acid and processed prior to feeding to finishing beef cattle. Recently new techniques have been developed for storing and feeding grain to beef cattle. The objective of the current study was to evaluate the effects of grain storage and processing method, and grain feed level on performance and meat quality of beef cattle offered two contrasting feed value grass silages.

Ensiled Maize And Whole Crop Wheat Forages For Beef And Dairy Cattle: Effects On Animal Performance, T. W. J. Keady

IGC Proceedings (1997-2023)

Key points

1. Maize silage can be produced and fed to beef and dairy cattle at a similar price to grazed grass.
2. Including maize silage in the diet increases feed intake and performance of beef and dairy cattle.
3. The optimum stage of maturity at harvest for increased performance is at a dry matter concentration of approximately 300 g/kg.
4. Including maize silage in grass silage-based diets has a concentrate sparing effect of up to 5 kg/cow/d.
5. There is a negative relationship between stage of maturity at harvest and milk fat concentration.
6. Whole crop wheat can be produced and fed at a similar …

Recent Developments In Feeding Beef Cattle On Grass Silage-Based Diets, M. Mcgee

IGC Proceedings (1997-2023)

Key points:

1. High digestibility grass silage with moderate concentrate supplementation can sustain a large proportion of the cattle performance achieved on high concentrate diets.
2. Increasing concentrate supplementation reduces the importance of grass silage nutritional value.
3. Subsequent compensatory growth diminishes the advantage of concentrate supplementation of young cattle.
4. Meat quality and fatty acid composition can be influenced by grass silage-based diets.

Ensiled High Moisture Barley Or Dry Barley In The Grass Silage-Based Diet Of Dairy Cows, S. Jaakkola, E. Saarisalo, R. Kangasniemi

IGC Proceedings (1997-2023)

Ensiling high moisture grain is based on a procedure similar to ensiling grass. Soluble carbohydrates of grain are partly fermented into acids and some protein is degraded. Thus the nutritional quality is modified by the preservation method. Two trials were conducted to compare the effects of dry barley (DB) and ensiled barley (EB) in a total mixed ration (TMR) on feed intake and milk production of dairy cows.

The Effect Of Neutralising Formic Acid On Fermentation Of Fresh And Wilted Grass Silage, E. Saarisalo, S. Jaakkola

IGC Proceedings (1997-2023)

Rapid drop in pH is essential for minimising proteolysis and successful ensiling. Use of acid additives typically reduces protein degradation and restricts fermentation. The effects of acid additive depend on application rate and type of herbage. Corrosiveness and risks in handling formic acid (FA) can be reduced by using salts of FA like ammonium formate (AF). Increasing proportions of AF replacing FA were applied into grass at two dry matter (DM) contents to evaluate the effects of neutralised FA on silage pH and fermentation.

Effects Of Inoculation Of Lab On Fermentation Pattern And Clostridia Spores In Easily Ensilable Grass Silages, J. Thaysen, G. Pahlow, E. Mathies

IGC Proceedings (1997-2023)

Clostridia can damage the protein quality of grass silages. They cause high gas losses during the fermentation process and quality problems in dairy products like semi-hard cheeses. In comparison to the effect of chemicals such as nitrite on undesirable clostridia in grass silages the respective inhibitory mechanism of LAB requires further investigation. The objective of this experiment was to study under laboratory conditions novel isolates of lactic acid bacteria (LAB), selected for their inhibitory effect on clostridia in grass silages.

A Novel Bacterial Silage Additive Effective Against Clostridial Fermentation, E. Mayrhuber, M. Holzer, W. Kramer, E. Mathies

IGC Proceedings (1997-2023)

Silage quality is determined by factors including the content of butyric acid and ammonium-N. These parameters have to be restricted especially in lightly wilted silages due to a higher risk of clostridia contamination. In this study a novel silage additive was tested in grass silages of low dry matter content. The objective of this experiment was to explore the effect of the silage additive on quality parameters in comparison to an untreated control.