Estimation of diet organic matter digestibility in grazing dairy cows

<span lang="EN">The research aims to evaluate protected fat supplementation to Friesian Holstein (FH) dairy cattle digestibility based on diet digestibility (dry matter and organic matter consumption; dry matter and organic matter digestibility). The reseach was conducted for 12 weeks, at the Breeding Center for Dairy Cattle (BBPTU-SP) Baturraden. The material used is 12 FH dairy cows. The experiment consists of two treatment i.e. P0: basal diet and P1: basal diet + 3% protected fat supplementation. Each treatment was repeated 6 times. Data were analyzed by independent samples t-test analysis. Result showed that fat protected supplementation had no effect on dry matter and organic matter consumption; dry matter and organic matter digestibility.</span>

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Effects of season of growth and digestibility of herbage on intake by grazing dairy cows

Animal Science ◽

10.1017/s0003356100021619 ◽

1963 ◽

Vol 5 (2) ◽

pp. 119-129 ◽

Cited By ~ 33

Author(s):

J. L. Corbett ◽

J. P. Langlands ◽

G. W. Reid

Keyword(s):

Organic Matter ◽

Dairy Cows ◽

Live Weight ◽

Late Summer ◽

Practical Experience ◽

Digestible Organic Matter ◽

Feeding Value ◽

Grazing Dairy Cows ◽

Maintenance Requirements ◽

Strip Grazing

SUMMARY1. The intakes of herbage organic matter (OM) and digestible organic matter (DOM) by twenty dairy cows were measured during two periods of strip grazing on one pasture, in spring and late summer of the same year.2. Results from the first 5-day measurement period in the spring suggested that intakes at this time were restricted primarily because the cows had difficulty in gathering the short herbage. Measurements on ten of the cows continued during a further 5 weeks while the digestibility of the OM of grazed herbage declined from about 80 to 68%. There was a fall of about 20% in DOM intake by the cows during this period; one-quarter of the fall could be ascribed to a reduction in OM intake and the remainder to the decline in digestibility as such.3. Intakes were measured during two weeks in late summer and were compared with those measured during two weeks in the spring when the digestibility of the grazed herbage was similar. Intakes of DOM expressed as lb./lb. live-weight0·73 were the lower by about 10% in the late summer, or by from 10 to 20% in terms of DOM available for production when allowance had been made for maintenance requirements. This finding is discussed in relation to practical experience of the feeding value of autumn grass.

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A note on the storage of sodium hydroxide-treated whole-crop barley beneath grass and lucerne silage

Animal Science ◽

10.1017/s0003356100040046 ◽

1983 ◽

Vol 36 (1) ◽

pp. 143-146 ◽

Cited By ~ 1

Author(s):

A. Moore ◽

C. Harris

Keyword(s):

Organic Matter ◽

Chemical Analysis ◽

Thin Layer ◽

Dairy Cows ◽

Sodium Hydroxide ◽

Dry Matter ◽

Microbiological Examination ◽

Digestible Organic Matter ◽

Organic Matter Digestibility

ABSTRACTOne hundred tonnes of spring-sown barley harvested as whole crop were treated on a commercial farm with pearl sodium hydroxide at 46 g/kg dry matter.The treated material was stored in a silage clamp beneath grass and lucerne silage. A thin layer of grass, cut and wilted to hay-making dry matter, was placed immediately on top of the barley to absorb any silage effluent.Monthly samples were taken for microbiological examination and chemical analysis throughout winter storage, while the material was fed to British Friesian dairy cows. There was no evidence of fermentation by clostridia in the whole-crop barley or wilted grass and there was no spoilage of the exposed feeding face. The treatment increased the in vitro organic matter digestibility and the in vitro digestible organic matter in the dry matter of the whole-crop barley. No excessive urination or other ill effects were observed in the stock.The method proved practical for the satisfactory storage and feeding of sodium hydroxide-treated whole-crop barley.

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In sacco degradation of organic matter and crude protein of fresh grass (Lolium perenne) in the rumen of grazing dairy cows

The Journal of Agricultural Science ◽

10.1017/s0021859600078242 ◽

1991 ◽

Vol 116 (3) ◽

pp. 429-436 ◽

Cited By ~ 64

Author(s):

A. M. van Vuuren ◽

S. Tamminga ◽

R. S. Ketelaar

Keyword(s):

Organic Matter ◽

Dairy Cows ◽

Lolium Perenne ◽

Nitrogen Fertilization ◽

Crude Protein ◽

Clay Soil ◽

Crude Protein Content ◽

N Application ◽

Grazing Dairy Cows ◽

In Sacco

SUMMARYIn three experiments, carried out in 1985 and 1986 in the Netherlands, the effects of herbage maturation and rate of nitrogen fertilization on rumen degradability of organic matter (OM) and crude protein (CP) in fresh herbage (Lolium perenne) were studied using the nylon bag technique. Experimental farms at Lelystad and Swifterbant (clay soil) and Achterberg (sandy soil) provided the herbage samples. From the results, the content of digestible CP entering the small intestine (DPI) was estimated.Crude protein content and in sacco degradability of OM and CP decreased with increasing grass maturity and with decreasing rate of N application. With every 100 g/kg DM decrease in CP content, the estimated content of DPI decreased by 19 g/kg DM, no matter how the CP content was manipulated.

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The effect of severity of grazing on milk production of grazing dairy cows

Proceedings of the British Society of Animal Production (1972) ◽

10.1017/s0308229600013854 ◽

1984 ◽

Vol 1984 ◽

pp. 20-20

Author(s):

C.S. Mayne ◽

R.D. Newberry ◽

S.C.F. Woodcock

Keyword(s):

Organic Matter ◽

Dairy Cows ◽

Milk Production ◽

Dairy Cow ◽

Rapid Decline ◽

Rotational Grazing ◽

Herbage Intake ◽

Grazing System ◽

Grazing Dairy Cows ◽

The Relationship

Hodgson (1975) has shown that herbage intake of the grazing dairy cow is maximised when the daily herbage allowance on offer is equivalent to four times the amount eaten, with a rapid decline in intake when herbage allowance falls below 40g organic matter/kg liveweight/day. This relationship between herbage intake and allowance results from the increasing difficulty of prehending herbage as the sward is grazed closer to the ground. Under a rotational grazing system, the height to which grass is grazed (residual herbage height) is a useful estimate of the amount of herbage available to the grazing animal. The present study was designed to establish the relationship between residual herbage height and milk production.

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EVALUASI NILAI BIOLOGIS BAHAN KERING DAN BAHAN ORGANIK PAKAN LENGKAP BERBASIS TEBON JAGUNG PADA SAPI PERAH

ZOOTEC ◽

10.35792/zot.40.2.2020.29527 ◽

2020 ◽

Vol 40 (2) ◽

pp. 570

Author(s):

Meylin Manganang ◽

Ronny A.V. Tuturoong ◽

Abraham F. Pendong ◽

Merci R. Waani

Keyword(s):

Organic Matter ◽

Dairy Cows ◽

Statistical Method ◽

Dry Matter ◽

T Test ◽

Unequal Variance ◽

Biological Value ◽

Dry Matter Digestibility ◽

Organic Matter Digestibility

EVALUATION OF BIOLOGICAL VALUE OF DRY MATTER AND ORGANIC MATTER COMPLETE FEED BASED ON CORN FORAGE IN DAIRY COWS. This aim of this study was to determine intakes and digestibility of the dry matter and organic matter of complete feed based on corn forage. 14 FH cows weighing 300-400 kg were used in this research. The feed treatments consist of Ra (30% concentrate + 70% corn forage), and Rb (30% concentrate + 35% corn forage + 35% king grass). This experiment arranged in a statistical method of t-test two sample assuming unequal variance. The variables observed were intakes and digestibilities of both dry matter and organic. The results shows that the intakes of both dry matter and organic matter in the Ra were not significantly different from the Rb (P> 0.05). The dry matter digestibility of Rb were highly significant different from Ra (P<0.01), as well as organic matter digestibility of Rb was also significantly different from Ra (P <0.05). It is concluded that complete feed consisting of concentrate, corn forage and king grass was obtained the best digestibilities of both dry matter and organic matter.

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The effects of grazing intensity on herbage consumption and animal production: II. Longer-term effects in strip-grazed dairy cows

The Journal of Agricultural Science ◽

10.1017/s002185960001861x ◽

1967 ◽

Vol 69 (2) ◽

pp. 217-223 ◽

Cited By ~ 16

Author(s):

J. F. D. Greenhalgh ◽

G. W. Reid ◽

J. N. Aitken

Keyword(s):

Organic Matter ◽

Weight Gain ◽

Dairy Cows ◽

Live Weight ◽

Grazing Intensity ◽

Milk Composition ◽

Weight Changes ◽

Long Period ◽

Herbage Intake ◽

Grazing Dairy Cows

1. The object of the experiment was to determine the effects on the diet and production of grazing dairy cows of providing different quantities of herbage over a relatively long period.2. Three groups of five Ayrshire cows were strip grazed on areas supplying (A) 25, (B) 35 or (C) 45 lb D.M. per cow per day, for a total of 11 weeks. Three swards were used in succession, and measurements of herbage intake, milk production and live-weight changes were made over the last 10 weeks.3. Mean intakes for treatments A–C, respectively, were 23·9, 25·6 and 26·4 lb organic matter per cow per day, and milk yields were 30·4, 30·8 and 32·8 lb. Differences in digestibility between treatments were small, even when the cows grazed poor herbage in which the organic matter was only 68 % digestible.4. The treatments had no significant effects on milk composition or live-weight gain, although the latter was less for treatment A.

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Identification of Genomic Regions Associated with Concentrations of Milk Fat, Protein, Urea and Efficiency of Crude Protein Utilization in Grazing Dairy Cows

Genes ◽

10.3390/genes12030456 ◽

2021 ◽

Vol 12 (3) ◽

pp. 456

Author(s):

Hewa Bahithige Pavithra Chathurangi Ariyarathne ◽

Martin Correa-Luna ◽

Hugh Thomas Blair ◽

Dorian John Garrick ◽

Nicolas Lopez-Villalobos

Keyword(s):

Gene Ontology ◽

New Zealand ◽

Dairy Cows ◽

Candidate Genes ◽

Milk Fat ◽

Crude Protein ◽

Single Locus ◽

Protein Utilization ◽

Grazing Dairy Cows ◽

Genomic Regions

The objective of this study was to identify genomic regions associated with milk fat percentage (FP), crude protein percentage (CPP), urea concentration (MU) and efficiency of crude protein utilization (ECPU: ratio between crude protein yield in milk and dietary crude protein intake) using grazing, mixed-breed, dairy cows in New Zealand. Phenotypes from 634 Holstein Friesian, Jersey or crossbred cows were obtained from two herds at Massey University. A subset of 490 of these cows was genotyped using Bovine Illumina 50K SNP-chips. Two genome-wise association approaches were used, a single-locus model fitted to data from 490 cows and a single-step Bayes C model fitted to data from all 634 cows. The single-locus analysis was performed with the Efficient Mixed-Model Association eXpedited model as implemented in the SVS package. Single nucleotide polymorphisms (SNPs) with genome-wide association p-values ≤ 1.11 × 10−6 were considered as putative quantitative trait loci (QTL). The Bayes C analysis was performed with the JWAS package and 1-Mb genomic windows containing SNPs that explained > 0.37% of the genetic variance were considered as putative QTL. Candidate genes within 100 kb from the identified SNPs in single-locus GWAS or the 1-Mb windows were identified using gene ontology, as implemented in the Ensembl Genome Browser. The genes detected in association with FP (MGST1, DGAT1, CEBPD, SLC52A2, GPAT4, and ACOX3) and CPP (DGAT1, CSN1S1, GOSR2, HERC6, and IGF1R) were identified as candidates. Gene ontology revealed six novel candidate genes (GMDS, E2F7, SIAH1, SLC24A4, LGMN, and ASS1) significantly associated with MU whose functions were in protein catabolism, urea cycle, ion transportation and N excretion. One novel candidate gene was identified in association with ECPU (MAP3K1) that is involved in post-transcriptional modification of proteins. The findings should be validated using a larger population of New Zealand grazing dairy cows.

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Supplementation of grazing dairy cows with a brewers grains/treated straw mixture

Proceedings of the British Society of Animal Production (1972) ◽

10.1017/s0308229600018274 ◽

1990 ◽

Vol 1990 ◽

pp. 46-46 ◽

Cited By ~ 1

Author(s):

J.D. Leaver ◽

R.C. Campling

Keyword(s):

Dairy Cows ◽

Crude Protein ◽

Dry Matter ◽

Barley Straw ◽

Severe Drought ◽

Grass Silage ◽

Metabolisable Energy ◽

Grazing Dairy Cows ◽

Similar Cost ◽

Friesian Cows

Supplementary feeding of grazing dairy cows is often uneconomic, and whilst supplementation with silage (buffer feeding) can be worthwhile, this often leads to a depletion of winter forage stores. In this study, a mixture of brewers grains and treated straw was used as a supplement. Offered as a 1:1 mixture in the dry matter (DM), it is a purchased substitute for grass silage, having a similar cost, and similar metabolisable energy (ME) and crude protein (CP) contents. The high seasonality adjustments to milk price in mid-late season make supplementation potentially worthwhile.Experiments were carried out from April to September in 1988 and 1989, which had moderate and very low rainfall respectively. Each year 20 British Friesian cows which calved December to March (1988 experiment) and February-April (1989) were allocated at random to either treatment B or C. In B, the cows were offered a 1:1 mixture (DM basis) of brewers grains and NaOH treated chopped barley straw for 60 minutes after morning milking. In C, the cows received no supplement. Both groups were fed 1.0 kg/day of concentrates in the milking parlour. Due to the severe drought in 1989, concentrate feeding was increased to 5.0 kg/day for all cows during the last 4 weeks of the experiment. Also, urea-treated whole crop wheat was fed at a level of 2.5 kg DM/day during the last 7 days.

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