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You searched for: Journal Journal of dairy science Remove constraint Journal: Journal of dairy science Publication Year 2009 Remove constraint Publication Year: 2009 Source 2009 v.92 no.7 Remove constraint Source: 2009 v.92 no.7 Subject lactation stage Remove constraint Subject: lactation stage Text Availability Citation in PubAg Remove constraint Text Availability: Citation in PubAg
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1. Effect of abomasal glucose infusion on splanchnic amino acid metabolism in periparturient dairy cows

Author:
Larsen, M.; Kristensen, N.B.
Source:
Journal of dairy science 2009 v.92 no.7 pp. 3306-3318
ISSN:
0022-0302
Subject:
dairy cows; Holstein; abomasum; splanchnic tissues; amino acids; amino acid metabolism; glucose; prepartum period; postpartum interval; dry matter intake; perinatal period; essential amino acids; liver; nutrient uptake; urea; intestinal absorption; gluconeogenesis; carbohydrate metabolism; lactation stage
Abstract:
... Six Holstein cows fitted with ruminal cannulas and permanent indwelling catheters in the portal vein, hepatic vein, mesenteric vein, and an artery were used to study the effects of abomasal glucose infusion on splanchnic AA metabolism. The experimental design was a split plot, with cow as the whole plot, treatment as the whole-plot factor and days in milk (DIM) as the subplot factor. Cows were ass ...
DOI:
10.3168/jds.2008-1889
PubMed:
19528608

2. Effect of DL-malic acid supplementation on feed intake, methane emissions, and performance of lactating dairy cows at pasture

Author:
Foley, P.A.; Kenny, D.A.; Lovett, D.K.; Callan, J.J.; Boland, T.M.; O'Mara, F.P.
Source:
Journal of dairy science 2009 v.92 no.7 pp. 3258-3264
ISSN:
0022-0302
Subject:
dairy cows; lactation stage; malic acid; cow feeding; feed intake; feed supplements; methane; methane production; Holstein; grazing; parity (reproduction); milk yield; feed concentrates; dry matter intake; liveweight gain; experimental diets
Abstract:
... The objective of this study was to determine the effect of dietary DL-malic acid (MA) supplementation on feed intake, methane (CH₄) emissions, and performance of mid lactation Holstein-Friesian cows at pasture. Twenty-four (6 primiparous and 18 multiparous) mid- to late-lactation cows (206 ± 65 d in milk) grazing a mixed-species grass sward were blocked on parity, days in milk, and pretrial milk y ...
DOI:
10.3168/jds.2008-1633
PubMed:
19528602

3. Effects of sodium sesquicarbonate on dry matter intake and production of milk and milk components by Holstein cows

Author:
Clark, J.H.; Christensen, R.A.; Bateman, H.G. II.; Cummings, K.R.
Source:
Journal of dairy science 2009 v.92 no.7 pp. 3354-3363
ISSN:
0022-0302
Subject:
dairy cows; Holstein; dry matter intake; body weight; milk yield; milk composition; cow feeding; lactation; buffers; sodium carbonate; diet; experimental diets; milk fat percentage; milk protein percentage; milk quality; lactation stage; dietary protein; dietary fat; proteolysis
Abstract:
... Forty-six multiparous Holstein cows were used to investigate the effects of sodium sesquicarbonate on dry matter intake, body weight, and production and composition of milk during a 308-d lactation. Diets contained alfalfa silage, corn silage, and concentrate. Composition of diets was changed twice during the 308-d lactation experiment. Diets fed during d 1 to 175 and d 176 to 245 were formulated ...
DOI:
10.3168/jds.2008-1995
PubMed:
19528612

4. Effects of stage of lactation and dietary forage level on body composition of Alpine dairy goats

Author:
Ngwa, A.T.; Dawson, L.J.; Puchala, R.; Detweiler, G.; Merkel, R.C.; Wang, Z.; Tesfai, K.; Sahlu, T.; Ferrell, C.L.; Goetsch, A.L.
Source:
Journal of dairy science 2009 v.92 no.7 pp. 3374
ISSN:
0022-0302
Subject:
goats; lactation stage; forage; feed intake; body weight; animal feeding; Alpine (goat breed); body composition; kidding; alfalfa; pelleted feeds; corn meal; soybean meal; feed supplements; lipids; liveweight gain; energy metabolism; repletion; body fat; milk yield; gastrointestinal system; tissue weight; carcass composition
Abstract:
... Multiparous Alpine does (42) were used to determine how stage of lactation and dietary forage level affect body composition. The feeding and body composition portion of the study had a 2 x 3 factorial arrangement of treatments. Eighteen does were fed a 40% forage diet (40F) and 18 received a diet with 60% forage (60F) for approximately 2, 4, or 6 mo of lactation (59 ± 1.3, 116 ± 1.0, and 184 ± 1.4 ...
Handle:
10113/34229
DOI:
10.3168/jds.2009-2079
PubMed:
19528614
CHORUS:
10.3168/jds.2009-2079

5. Genetic parameters of milking frequency and milk production traits in Canadian Holsteins milked by an automated milking system

Author:
Nixon, M.; Bohmanova, J.; Jamrozik, J.; Schaeffer, L.R.; Hand, K.; Miglior, F.
Source:
Journal of dairy science 2009 v.92 no.7 pp. 3422-3430
ISSN:
0022-0302
Subject:
dairy cows; milking frequency; Holstein; milking machines; automation; quantitative traits; milk yield; estimation; milk fat yield; milk protein yield; somatic cell count; milk composition; milk quality; calving; mathematical models; genetic correlation; lactation stage; heritability; genetic variance; Ontario
Abstract:
... Twice-a-day milking is currently the most frequently used milking schedule in Canadian dairy cattle. However, with an automated milking system (AMS), dairy cows can be milked more frequently. The objective of this study was to estimate genetic parameters for milking frequency and for production traits of cows milked within an AMS. Data were 141,927 daily records of 953 primiparous Holstein cows fr ...
DOI:
10.3168/jds.2008-1689
PubMed:
19528620

6. Relationship between somatic cell count and milk yield in different stages of lactation

Author:
Hagnestam-Nielsen, C.; Emanuelson, U.; Berglund, B.; Strandberg, E.
Source:
Journal of dairy science 2009 v.92 no.7 pp. 3124-3133
ISSN:
0022-0302
Subject:
somatic cell count; milk yield; lactation stage; dairy cows; bovine mastitis; parity (reproduction); disease severity; seasonal variation; breed differences; postpartum interval; cattle diseases; animal reproduction; hooves
Abstract:
... The association between somatic cell count (SCC) and daily milk yield in different stages of lactation was investigated in cows free of clinical mastitis (CM). Data were recorded between 1989 and 2004 in a research herd, and consisted of weekly test-day (TD) records from 1,155 lactations of Swedish Holstein and Swedish Red cows. The main data set (data set A) containing 36,117 records excluded TD ...
DOI:
10.3168/jds.2008-1719
PubMed:
19528590

7. Seasonal incidence of lameness and risk factors associated with thin soles, white line disease, ulcers, and sole punctures in dairy cattle

Author:
Sanders, A.H.; Shearer, J.K.; De Vries, A.
Source:
Journal of dairy science 2009 v.92 no.7 pp. 3165-3174
ISSN:
0022-0302
Subject:
lameness; dairy cows; seasonal variation; cattle diseases; hooves; lesions (animal); feet; animal injuries; incidence; disease incidence; lactation stage; parity (reproduction); summer; heat stress
Abstract:
... Lameness is a multifactorial condition with many causes. In this study, cow lifetime records were used to quantify the incidence of specific lameness-causing lesions and investigate factors associated with those lesions. Of primary interest were the effects of seasonality and the effects of thin soles (TS). Thin sole-induced toe ulcers (TSTU) occurring adjacent to the white line in the apical port ...
DOI:
10.3168/jds.2008-1799
PubMed:
19528594

8. Variations in bovine milk oligosaccharides during early and middle lactation stages analyzed by high-performance liquid chromatography-chip/mass spectrometry

Author:
Tao, N.; DePeters, E.J.; German, J.B.; Grimm, R.; Lebrilla, C.B.
Source:
Journal of dairy science 2009 v.92 no.7 pp. 2991-3001
ISSN:
0022-0302
Subject:
milk; milk composition; lactation stage; early lactation; milk analysis; oligosaccharides; carbohydrate composition; chemical structure; neuraminic acid; breed differences; anions
Abstract:
... Milk oligosaccharides (OS) are not only a source of nutrition for newborns, but also provide numerous important biological functions including the prevention of pathogen binding to the intestinal epithelium and serving as nutritive sources for beneficial bacteria. High-performance mass spectrometry and separation methods were used to evaluate changes of bovine milk oligosaccharides (bMO) in differ ...
DOI:
10.3168/jds.2008-1642
PubMed:
19528576