scholarly journals External validation of the GrazeIn model of pasture dry matter intake and milk yield prediction for cows managed at different calving dates and stocking rates

2018 ◽  
Vol 15 (4) ◽  
pp. e0608
Author(s):  
Ana I. Roca-Fernández ◽  
Antonio González-Rodríguez
Keyword(s):  
Milk Yield ◽  
Dry Matter ◽  
External Validation ◽  
Dry Matter Intake ◽  
Holstein Friesian ◽  
Grazing System ◽  
The Mean ◽  
Using Data ◽  
Stocking Rates ◽  
Friesian Cows

The aim was to evaluate the prediction accuracy of pasture dry matter intake (PDMI) and milk yield (MY) predicted by the GrazeIn model using a database representing 124 PDMI measurements at paddock level and 2232 MY measurements at cow level. External validation of the model was conducted using data collected from a trial carried out with Holstein-Friesian cows (n=72) while grazed 28 paddocks and were managed in a 2×2 factorial design by considering two calving dates (CD), with different number of days in milk (DIM), early (E, 29 DIM) vs. middle (M, 167 DIM), and two stocking rates (SR), medium (M, 3.9 cows ha-1) vs. high (H, 4.8 cows ha-1), under a rotational grazing system. Cows were randomly assigned to four grazing scenarios (EM, EH, MM and MH). The mean observed PDMI of the total database was 14.2 kg DM cow-1 day-1 while GrazeIn predicted a mean PDMI for the database of 13.8 kg DM cow-1 day-1. The mean bias was −0.4 kg DM cow-1 day-1. GrazeIn predicted PDMI for the total database with a relative prediction error (RPE) of 10.0% at paddock level. The mean observed MY of the database was 23.2 kg cow-1 day-1 while GrazeIn predicted a MY for the database of 23.1 kg cow-1 day-1. The mean bias was –0.1 kg cow-1 day-1. GrazeIn predicted MY for the total database with a mean RPE of 17.3% at cow level. For the scenarios investigated, GrazeIn predicted PDMI and MY with a low level of error which made it a suitable tool for decision support systems.

scholarly journals Milk yield and composition, feed intake and stocking rate of crossbread cows in tropical grasses managed in a rotational grazing system

2010 ◽  
Vol 39 (7) ◽  
pp. 1548-1557 ◽  
Author(s):  
Nelson Massaru Fukumoto ◽  
Julio Cesar Damasceno ◽  
Fermino Deresz ◽  
Carlos Eugênio Martins ◽  
Antônio Carlos Cóser ◽  
...  
Keyword(s):  
Body Weight ◽  
Milk Yield ◽  
Dry Matter ◽  
Experimental Period ◽  
The Body ◽  
Dry Matter Intake ◽  
Panicum Maximum ◽  
Stocking Rate ◽  
Rotational Grazing ◽  
Grazing System

The objective of this study was to evaluate milk yield and composition, dry matter intake, and stocking rate in pastures with tanzania grass (Panicum maximum cv. Tanzânia), star grass (Cynodon nlemfuensis cv. Estrela-Africana), and marandu grass (Brachiaria brizantha cv. Marandu). The grasses were managed in a rotational grazing system with Holstein x Zebu crossbreed cows, with a 30-day resting period and three days of paddock occupation. The pastures were fertilized with 1,000 kg/ha/year using the 20:05:20 (NPK) formula, split in three applications during the rainy season. It was used a complete random block experimental design with three factors being studied and two replications. In the experiment, four cows/paddock were used and, when it was necessary, regulator animals were added in order to obtain a supply of 7% body weight green forage dry matter. The animals were individually fed concentrate at 2 kg/day during the experimental period. Milk yield did not differ among the three grasses, with values of 9.1; 9.1; and 8.7 kg/cow/day for pastures with tanzania grass, star grass and marandu grass, respectively. Similarly, grass did not affect milk chemical composition. Stocking rate was similar among the three grasses, with values of 4.6; 4.5 and 5.0 UA/ha for tanzania grass, star grass and marandu grass, respectively. The highest dry matter intake was observed for tanzania grass with 2.6% of the body weight while stargrass (2.3%) and marandu grass (2.4%) did not differ among each other. The highest dry matter intake on tanzania grass pasture was not reflected on milk yield per animal. Milk yield and composition and stocking rate are similar among the evaluated grasses.

scholarly journals Comparison of yield, composition and quality of milk of Polish Holstein-Friesian cows in conventional and automatic milking systems

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Magdalena Kolenda ◽  
Dariusz Piwczyński ◽  
Marcin Brzozowski ◽  
Beata Sitkowska ◽  
Piotr Wójcik
Keyword(s):  
Milk Yield ◽  
Dry Matter ◽  
Fat Content ◽  
Urea Content ◽  
Holstein Friesian ◽  
Automatic Milking ◽  
Automatic Milking Systems ◽  
Quality Of Milk ◽  
L1 And L2 ◽  
Friesian Cows

AbstractThe aim of the present study was to evaluate the changes in selected production and functional traits of Polish Holstein-Friesian cows after switching from a conventional (CMS) to an automatic milking system (AMS). The study consisted of 3398 Polish Holstein- Friesian dairy cows, from 16 herds in which CMS was changed to AMS. Cows were in their 1st (L1) or 2nd lactation (L2). The data consisted of milk yield [MY, kg], fat content [FC, %], protein content [PC, %], dry matter [DM, %], lactose content [LC, %], urea content [MU, mg/l], somatic cell count [SCC, thous./ml] and score [SCS, log]. The milking system had a significant impact on milk yield, fat, lactose, dry matter and urea contents. Regardless of lactation number, milk derived from CMS was characterised by higher values for FC, PC, DM SCC and SCS, while milk from AMS had higher MY, LC and MU. Multifactor analysis of variance also confirmed significant effect of herd, season, herd × milking system interaction on SCS in milk of cows in L1. In the studied herds change from CMS to AMS was evaluated separately for cows in L1 and L2. The transitioning from CMS to AMS resulted in the decrease of fat content in 6 L1 and 7 L2 herds, dry matter in 8 L1 and 5 L2 herds. SCS in milk also decreased in 4 L1 and 5 L2 herds. The change caused the increase of MY in 11 L1 and 9 L2 herds, lactose content in 6 L1 and 4 L2 herds and urea content in 9 L1 and 10 L2 herds. AMS may positively affect milk yield and health status, however, the change of milking system should be also accompanied by the change in herd management.

scholarly journals Dry Matter Intake, Digestibility and Milk Yield by Friesian Cows Fed Two Napier Grass Varieties

2002 ◽  
Vol 15 (4) ◽  
pp. 516-521 ◽  
Author(s):  
W. Gwayumba ◽  
D. A. Christensen ◽  
J. J. McKinnon ◽  
P. Yu
Keyword(s):  
Milk Yield ◽  
Dry Matter ◽  
Napier Grass ◽  
Dry Matter Intake ◽  
Friesian Cows

Influence of diet composition, dry-matter intake, milk production and energy balance on time of post-partum ovulation and fertility in dairy cows

1992 ◽  
Vol 54 (3) ◽  
pp. 323-331 ◽  
Author(s):  
M. C. Lucy ◽  
C. R. Staples ◽  
W. W. Thatcher ◽  
P. S. Erickson ◽  
R. M. Cleale ◽  
...  
Keyword(s):  
Energy Balance ◽  
Dry Matter ◽  
Ovarian Function ◽  
Post Partum ◽  
Food Additives ◽  
Dry Matter Intake ◽  
Holstein Friesian ◽  
Days Open ◽  
Post Partum Period ◽  
Friesian Cows

AbstractLactating Holstein-Friesian cows from two calving groups (no. = 90) were studied during the early post-partum period to determine the effect of dry-matter intake (DM1), 40 g/kg fat-corrected milk (FCM) production, energy balance (EB), parity, and food additives (calcium salts of long-chain fatty acids [CaLCFA] and niacin) on the recrudescence of ovarian function and establishment of pregnancy. Cows that ovulated early during the post-partum period (15 to 21 days after calving) consumed more food and tended to produce more FCM compared with cows ovulating later (22 to 42 days or after 42 days). Primiparous cows had lower EB and tended to have longer intervals to first ovulation compared with multiparous cows but the average interval to pregnancy was similar for primiparous and multiparous cows. Feeding CaLCFA tended to extend the interval to first service and decreased pregnancy rate. Production characteristics (including DMI and FCM production) seem to determine interval from calving to first ovulation as well as interval from calving to pregnancy (days open). Fertility was affected negatively by feeding CaLCFA.

Effects of nitrogen fertilizer applied in autumn and winter on milk production from a tropical grass-legume grazed at four stocking rates

1976 ◽  
Vol 16 (83) ◽  
pp. 829 ◽  
Author(s):  
RT Cowan ◽  
TH Stobbs
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Nitrogen Fertilizer ◽  
Dry Matter ◽  
Panicum Maximum ◽  
Botanical Composition ◽  
Second Year ◽  
Autumn And Winter ◽  
Stocking Rates ◽  
Friesian Cows

The effect of applying 50 kg N ha-I in autumn and winter each year on milk yield of Friesian cows and dry matter yield and botanical composition of a green panic (Panicum maximum var, trichog1ume)- glycine (Glycine wightii cv. Tinaroo) pasture was measured over two years on the Atherton Tableland, north Queensland. Pastures were grazed at 1.3, 1.6, 1.9 and 2.5 cows ha-1. Milk yield and pasture yield were increased by nitrogen fertilization, particularly at the high stocking rates (P < 0.05). Increases in milk yield from mid-autumn to spring almost totally accounted for increases in annual milk production. Nitrogen fertilizer did not decrease the yield of legume, but legume content of the pasture was reduced in the second year (P < 0.01). Response by non-leguminous species to nitrogen increased (P < 0.05) with stocking rate, a change associated with decreasing legume contents of the pastures. Average fat corrected milk (FCM) yield per cow from mid-autumn to spring was restricted by less than 1600 kg pasture D.M. on offer cow-I or 2500 kg D.M. ha-1. When compared at the same dry matter yields, FCM yield was always higher from nitrogen fertilized pastures than from pastures not recieving fertilizer nitrogen.

The influence of winter nutrition, grazing system and stocking rate on the performance of spring-calving Hereford × Friesian cows and their calves 2. Grazing system and stocking rate

1982 ◽  
Vol 34 (2) ◽  
pp. 225-237 ◽  
Author(s):  
R. D. Baker ◽  
J. M. Barker ◽  
Y. L. P. Le Du
Keyword(s):  
Weight Gain ◽  
Milk Yield ◽  
Growth Rates ◽  
Live Weight ◽  
Milk Composition ◽  
Stocking Rate ◽  
Calf Growth ◽  
Grazing System ◽  
Stocking Rates ◽  
Friesian Cows

ABSTRACTForty-eight Hereford × Friesian cows and their South Devon calves were paddock grazed at high or low stocking rates of 412 or 206 cows and calves per ha in experiment 1, and either paddock grazed or set stocked at high or low stocking rates of 4·12 or 2·74 cows and calves per ha in experiments 2 to 4.There was no significant effect of grazing system on milk yield, milk composition or calf growth but in experiment 2 paddock-grazed cows gained more weight than those set stocked. Cows at low stocking rates gained more weight than those at high stocking rates and, in general, gave more milk. Calf growth rates were also higher at low stocking rates in experiments 1, 3 and 4 but not in experiment 2. Milk composition was not significantly affected by stocking rate. There were substantial increases in calf live-weight gain per ha at the high stocking rate but, because of a lower gain by cows, the differences in total live-weight gains per ha for cows and calves were much smaller.

Use of whole cotton seed as a dietary supplement for grazing dairy cows

1993 ◽  
Vol 33 (3) ◽  
pp. 283 ◽  
Author(s):  
WK Ehrlich ◽  
RT Cowan ◽  
A Reid
Keyword(s):  
Milk Yield ◽  
Cotton Seed ◽  
Dry Matter ◽  
Subterranean Clover ◽  
Yield Response ◽  
Stocking Rate ◽  
Holstein Friesian ◽  
Grazing Dairy Cows ◽  
Sorghum Grain ◽  
Friesian Cows

In a 2-part preliminary experiment, groups of 6 and 9 Holstein-Friesian cows in early t o mid lactation were unsupplemented or supplemented with either 3 kg cracked sorghum grain or 3 kg whole cotton seed on a base pasture of irrigated pangola grass for 12 weeks or oats for 12 weeks. The stocking rate was 5 cows/ha. Supplementation did not affect milk yield or composition. In a second experiment a group of 20 Holstein- Friesian cows in early to mid lactation grazed on a base pasture of subterranean clover at a stocking rate of 4 or 6 cows/ha a n d w e r e either unsupplemented or supplemented with 3 kg of whole cotton seed (WCS) over 12 weeks. Milk yield averaged 20.3 kg/cow.day and there were no significant effects on milk yield or composition. We suggest the lack of a significant milk yield response was due to a high substitution rate of WCS for pasture, associated with an oil content in the diet of 7.1 % of dry matter.

scholarly journals Production Performance, Feed Efficiency and their Correlation in Lactating Kankrej Cows at Organized Farm

2018 ◽  
Vol 14 (3) ◽  
Author(s):  
Y.M. Gami ◽  
M.P. Patel ◽  
M.M. Pawar ◽  
A.B. Chaudhari ◽  
B.S. Rathod ◽  
...  
Keyword(s):  
Correlation Coefficient ◽  
Milk Yield ◽  
Feed Efficiency ◽  
Dry Matter ◽  
Milk Composition ◽  
Production Performance ◽  
Dry Matter Intake ◽  
The Mean ◽  
Highly Correlated

A study was conducted to assess production performance, feed efficiency and their correlation in lactating Kankrej cows at organized farm. The variables such as average dry matter intake, milk yield, milk composition and feed efficiency were evaluated in 49 lactating Kankrej cows over a period of 30 days. The mean dry matter intake was 9.71±0.08 kg/d. The average milk yield and energy corrected milk were 12.45±0.35 kg/d and 14.27±0.47 kg/d, respectively. Feed efficiency was 1.48±0.05 in Kankrej cows, and it was significantly affected by average milk yield and energy corrected milk. The average milk yield and energy corrected milk were highly correlated with feed efficiency. Pearson’s square correlation coefficient was 0.96 between feed efficiency and energy corrected milk.

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