Factors Associated with Variation in Milk Fat Depression Resulting from High Grain Diets Fed to Dairy Cows

Grummer, R. H.; Jacob, Ani Bency; Woodford, J.A.

doi:10.3168/jds.s0022-0302(87)80049-8

Cited by 26 publications

(4 citation statements)

References 12 publications

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“…Milk fat content was 0.27 percentage units lower (P < 0.01), and true protein content tended to be higher (P = 0.08) for cows fed LF than for cows fed HF. Treatment effects for milk yield and fat content were similar to a previous study in which feeding a low forage diet resulted in greater milk yield but a lower milk fat concentration (Grummer et al, 1987).…”

Section: Intake and Productionsupporting

confidence: 81%

Effects of Pretrial Milk Yield on Responses of Feed Intake, Digestion, and Production to Dietary Forage Concentration

Voelker

Burato

Allen

2002

Journal of Dairy Science

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The relationships between pretrial milk yield and effects of dietary forage-to-concentrate ratio on dry matter intake (DMI), digestion, and milk yield were evaluated using 32 Holstein cows in a crossover design with two 16-d periods. Cows were 197 +/- 55 (mean +/- SD) days in milk at the beginning of the experiment. Milk yield averaged 33.9 kg/d and ranged from 16.5 to 55.0 kg/d for the 4 d before initiation of treatments. Treatments were diets with forage-to-concentrate ratios of 67:33 and 44:56. Forages were alfalfa silage and corn silage, each at 50% of forage dry matter (DM). Neutral detergent fiber (NDF) concentrations of high-forage and low-forage diets were 30.7 and 24.3% of DM, respectively. Dry matter intake was 1.7 kg/d higher for cows fed the low-forage diet. Milk yield was 2.3 kg/d greater on low forage than on high forage, but 3.5% fat-corrected milk yield and yield of milk fat were not different between treatments. Individual DMI response to the low-forage diet relative to the high-forage diet (low-high) was positively and linearly related to pretrial fat-corrected milk yield, but fat-corrected milk yield response demonstrated a quadratic relationship with pretrial fat-corrected milk yield. Milk yield responded more positively to low forage among low- and high-producing cows than among moderate-producing cows. Energy partitioned to body reserves and to milk, and passage rate of indigestible NDF, also responded to dietary forage level in quadratic relationships with pretrial milk energy output. Individual responses of intake, production, and fiber digestion to a change in forage-to-concentrate ratio were dependent on production level.

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Section: Intake and Productionsupporting

confidence: 81%

Effects of Pretrial Milk Yield on Responses of Feed Intake, Digestion, and Production to Dietary Forage Concentration

Voelker

Burato

Allen

2002

Journal of Dairy Science

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“… Palmquist and Mattos (1978) have shown that majority of NEFA present in blood lipoproteins are of dietary origin. Increased plasma NEFA results from incomplete uptake of NEFA by peripheral tissues after hydrolysis of triglycerides in chylomicrons or very low-density lipoproteins by lipoprotein lipase ( Grummer et al, 1987 ; Chilliard, 1993 ).…”

Section: Resultsmentioning

confidence: 99%

Effect of increased inclusion of dried distillers grain supplement on adaptation, intake, digestibility, and rumen parameters in steers consuming bermudagrass round bale silage

Alava

Álava

Welchons³

et al. 2019

Translational Animal Science

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Eight ruminally cannulated beef steers were used to evaluate forage intake and physiological response during adaptation to a diet consisting of bermudagrass round bale silage (RBS) and dried distillers grains (DDG) and in a second experiment the effect of level of DDG supplementation on RBS forage intake, digestibility, and rumen parameters. The adaptation experiment was designed to simulate a 14-d step-up process. Initially steers received ad libitum RBS, on d 4 steers were offered 1.13 kg of DDG daily and every 4 d daily DDG offered was increased by 1.13 kg. Blood and rumen fluid samples were collected before feeding (0 h) and 6, 12, 24 (before feeding), and 36 h after every diet change. The digestibility experiment was conducted as an 8 × 4 Latin square with four periods. Treatments included RBS only and DDG supplement levels of 0.33%, 0.66%, and 1.0% of body weight (RBS + 0.33, +0.66, and 1.0, respectively). Collection periods consisted of 21 d to determine dry matter intake [DMI], digestibility, and collect rumen fluid samples. During adaptation, level of DDG did not (P = 0.42) affect RBS DMI. Mean ruminal pH was greater (P < 0.05) for RBS only compared with diets with DDG. When steers were offered 3.39 or 4.52 kg/d of DDG rumen NH3-N concentration was greater (P ≤ 0.05) compared with other levels of DDG or RBS alone. Mean nonesterified fatty acid and plasma urea N concentrations varied among levels of DDG offered. In the digestibility experiment forage DMI, total DMI, and total tract apparent digestibility exhibited a quadratic (P ≤ 0.05) response to level of DDG offered. Mean ruminal pH responded in a quadratic manner (P = 0.03) and was greater for RBS only compared with RBS plus DDG at any level. Mean ruminal NH3-N concentration tended (P = 0.07) to respond in a cubic manner as DDG amount offered increased. Physiological responses during adaptation to DDG over 14 d resembled responses previously observed after long-term DDG supplementation. Offering DDG up to 1% of body weight did depress forage DMI and ruminal pH but increased total DMI, diet digestibility, and ruminal NH3-N concentration.

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“…Auch Owens et al (31) sowie Mellau et al (27) konnten bei der Fütterung konzentratreicher Rationen eine metabolische systemische Azidose feststellen, die sich auch in signifikant niedrigeren Harn-pH-Werten äußerte. In verschiedene Publikationen wurden bei chronischen subklinischen Pansenazidosen weitere labordiagnostische Parameter wie Milchfettkonzentration, Kot-pH-Wert, Fruktosamin-, Betahydroxybutyratkonzentation und LDH-Aktivität im Blutplasma sowie Säure-Basen-Ausscheidung über den Harn (NSBA und Harn-pH-Wert) beschrieben (8,10,11,17). Betrachtet man jedoch die niedrigen Korrelationskoeffizienten zwischen Pansen-pH-Wert und den Parametern des Säure-Basen-Haushalts des Harns sowie die nicht befriedigende diagnostische Aussagekraft der Parameter des Säure-Basen-Haushalt des Harns in der vorliegenden Untersuchung, muss man den Schluss ziehen, dass für das Einzeltier mittels Harndiagnostik keine verlässliche Aussage hinsichtlich des Vorliegens einer Störung des Säure-Basen-Haushalts des Pansens zu treffen ist.…”

Section: Diskussionunclassified

Untersuchungen zum Säure-Basen-Haushalt in Pansen und Harn beim Milchrind

Kricziokat¹,

Wittek²,

Fürll³

2009

Tierarztl Prax Ausg G

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Zusammenfassung Gegenstand und Ziel: Subklinische Pansenazidosen gelten als eine häufig auftretende Veränderung des Säure-Basen-Haushalts beim Milchrind. Zielstellung der Untersuchung war, bei Rindern zu unterschiedlichen Laktationszeitpunkten gleichzeitig den Pansen-pH-Wert und Parameter des Säure-Basen-Haushalts des Harns zu bestimmen und die Aussagefähigkeit dieser Parameter hinsichtlich des Vorliegens subklinischer Pansenazidosen einzuschätzen. Material und Methode: Bei 348 Färsen und Kühen in 10 Milchviehherden erfolgte die simultane Gewinnung von Pansensaftproben mittels Pansensaftentnahmegerät nach Geishauser sowie von Harn mittels Blasenkatheter. Bestimmt wurden der Pansen-pH-Wert, der Harn-pH-Wert, die Netto-Säure- Basenausscheidung (NSBA) und der Basen-Säuren-Quotient (BSQ). Ergebnisse: Die Korrelationen zwischen Pansen-pH-Wert und HarnpH- Wert (r = 0,19, p < 0,001), Pansen-pH-Wert und NSBA (r = 0,13, p = 0,018) sowie Pansen-pH-Wert und BSQ (r = 0,13, p = 0,017) waren durch niedrige Koeffizienten gekennzeichnet. Ebenso ergaben sich für alle Parameter des Säure-Basen-Haushalts des Harns eine geringe Sensitivität und ein niedriger positiver Vorhersagewert hinsichtlich des Vorliegens einer Pansenazidose. Schlussfolgerung und klinische Relevanz: Die Parameter des Säure-Basen-Haushalts des Harns eignen sich für das Einzeltier unter Feldbedingungen nicht zur Abschätzung des Pansen-pH-Werts. Die Diagnose einer Pansenazidose muss auch weiterhin mittels direkter Untersuchung des Pansensaft-pH-Werts gestellt werden.

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Factors Associated with Variation in Milk Fat Depression Resulting from High Grain Diets Fed to Dairy Cows

Cited by 26 publications

References 12 publications

Effects of Pretrial Milk Yield on Responses of Feed Intake, Digestion, and Production to Dietary Forage Concentration

Effects of Pretrial Milk Yield on Responses of Feed Intake, Digestion, and Production to Dietary Forage Concentration

Effect of increased inclusion of dried distillers grain supplement on adaptation, intake, digestibility, and rumen parameters in steers consuming bermudagrass round bale silage

Untersuchungen zum Säure-Basen-Haushalt in Pansen und Harn beim Milchrind

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