Adaptation and evaluation of the GrazeIn model of grass dry matter intake and milk yield prediction for grazing dairy cows

The objective of this study was to evaluate the feasibility of using the dry matter intake of first 2 h after feeding (DMI-2h), body weight (BW), and milk yield to estimate daily DMI in mid and late lactating dairy cows with fed ration three times per day. Our dataset included 2840 individual observations from 76 cows enrolled in two studies, of which 2259 observations served as development dataset (DDS) from 54 cows and 581 observations acted as the validation dataset (VDS) from 22 cows. The descriptive statistics of these variables were 26.0 ± 2.77 kg/day (mean ± standard deviation) of DMI, 14.9 ± 3.68 kg/day of DMI-2h, 35.0 ± 5.48 kg/day of milk yield, and 636 ± 82.6 kg/day of BW in DDS and 23.2 ± 4.72 kg/day of DMI, 12.6 ± 4.08 kg/day of DMI-2h, 30.4 ± 5.85 kg/day of milk yield, and 597 ± 63.7 kg/day of BW in VDS, respectively. A multiple regression analysis was conducted using the REG procedure of SAS to develop the forecasting models for DMI. The proposed prediction equation was: DMI (kg/day) = 8.499 + 0.2725 × DMI-2h (kg/day) + 0.2132 × Milk yield (kg/day) + 0.0095 × BW (kg/day) (R2 = 0.46, mean bias = 0 kg/day, RMSPE = 1.26 kg/day). Moreover, when compared with the prediction equation for DMI in Nutrient Requirements of Dairy Cattle (2001) using the independent dataset (VDS), our proposed model shows higher R2 (0.22 vs. 0.07) and smaller mean bias (−0.10 vs. 1.52 kg/day) and RMSPE (1.77 vs. 2.34 kg/day). Overall, we constructed a feasible forecasting model with better precision and accuracy in predicting daily DMI of dairy cows in mid and late lactation when fed ration three times per day.

Download Full-text

Faecal near-infrared reflectance spectroscopy (NIRS) compared with other techniques for estimating the in vivo digestibility and dry matter intake of lactating grazing dairy cows

Animal Feed Science and Technology ◽

10.1016/j.anifeedsci.2012.02.005 ◽

2012 ◽

Vol 173 (3-4) ◽

pp. 220-234 ◽

Cited By ~ 10

Author(s):

V. Decruyenaere ◽

E. Froidmont ◽

N. Bartiaux-Thill ◽

A. Buldgen ◽

D. Stilmant

Keyword(s):

Dairy Cows ◽

Dry Matter ◽

Near Infrared ◽

Reflectance Spectroscopy ◽

Dry Matter Intake ◽

Infrared Reflectance ◽

Near Infrared Reflectance Spectroscopy ◽

Near Infrared Reflectance ◽

Grazing Dairy Cows

Download Full-text

Non-structural carbohydrates in the nutrition of high-yielding dairy cows during a transition period

Czech Journal of Animal Science ◽

10.17221/873-cjas ◽

2010 ◽

Vol 55 (No. 11) ◽

pp. 468-478 ◽

Cited By ~ 1

Author(s):

K. Poláková ◽

V. Kudrna ◽

A. Kodeš ◽

B. Hučko ◽

Z. Mudřík

Keyword(s):

Dairy Cows ◽

Milk Yield ◽

Body Condition ◽

Dry Matter ◽

Rumen Fluid ◽

Live Weight ◽

Dry Matter Intake ◽

Control Group ◽

Maize Starch ◽

Milk Performance

The main aim of this study was to investigate experimentally the effect of different composition of non-structural carbohydrates (NFC) in prepartum feed rations administered to high-yielding dairy cows at a high concentration of NFC in the diet on dry matter intake both before and after parturition and on subsequent milk performance, body condition and physiological traits of rumen fluid and blood. Thirty-six high-yielding dairy cows were allocated into one of the three well-balanced groups (K, O, and C), and each group received a different feeding rations. Feeding rations differed in non-structural carbohydrate (NFC) structure. The "K" (control) group received a feeding ration with NFC in the form of maize starch in particular, while the feeding rations of the other two (experimental) groups contained either (besides maize starch) saccharose from dried sugar beet (the "O" group) or a dominant amount of NFC was in the form of saccharose (the "C" group). After calving, all dairy cows were given the same feeding ration from the first day after parturition. The experiment was conducted for 21 days before and 50 days after calving. FR in the form of total mixed ration was offered ad libitum. Dry matter intake, milk performance, body condition, live weight, and blood and rumen parameters were recorded for the duration of the experiment. Average daily dry matter intake before calving was highest in the "K" group (14.32 kg per head). Differences among groups were statistically significant (P < 0.05). Prepartum dry matter consumption dropped as the rate of saccharose in the diet of cows increased. Dry matter consumption levelled off after calving. Milk yield was also highest in the "K" group (43.71 kg/head/day), but fatness of milk and thus the production of fat corrected milk were lowest in this group. The highest milk fat content (4.10%) and fat corrected milk production (44.03 kg/head/day) were recorded in the "C" group, whereas the highest milk protein concentration was found in the milk of the "O" group. The composition of NFC affected dry matter intake before parturition, but these concentrations did not significantly affect dry matter intake, milk yield, milk composition, live weight, body condition or blood serum and rumen fluid parameters after calving

Download Full-text

1411 The effect of by-product inclusion and concentrate feeding level on milk production and composition, pasture dry matter intake, body weight and body condition score of mid-late lactation spring calving grazing dairy cows

Journal of Animal Science ◽

10.2527/jam2016-1411 ◽

2016 ◽

Vol 94 (suppl_5) ◽

pp. 684-684 ◽

Cited By ~ 1

Author(s):

S. A. Condren ◽

S. J. Whelan ◽

T. M. Boland ◽

G. Rajauria ◽

S. Kirwan ◽

...

Keyword(s):

Body Weight ◽

Dairy Cows ◽

Milk Production ◽

Body Condition ◽

Dry Matter ◽

Body Condition Score ◽

Dry Matter Intake ◽

Feeding Level ◽

Condition Score ◽

Grazing Dairy Cows

Download Full-text

Comparative analyses of enteric methane emissions, dry matter intake and milk somatic cell count in different residual feed intake categories of dairy cows

Canadian Journal of Animal Science ◽

10.1139/cjas-2019-0085 ◽

2020 ◽

Author(s):

Dagnachew Hailemariam ◽

Ghader Manafiazar ◽

John A. Basarab ◽

Paul Stothard ◽

Filippo Miglior ◽

...

Keyword(s):

Dairy Cows ◽

Somatic Cell ◽

Cell Count ◽

Milk Yield ◽

Feed Intake ◽

Somatic Cell Count ◽

Dry Matter ◽

Residual Feed Intake ◽

Dry Matter Intake ◽

Milk Traits

This study compared the different residual feed intake (RFI) categories of lactating Holsteins with respect to methane emission, dry matter intake (kg), milk somatic cell count (SCC, 103/mL) and β-hydroxybutyrate (BHB, mmol/L). RFI was calculated in 131 lactating Holstein cows that were then categorized into –RFI (RFI<0) vs. +RFI (RFI>0) and low (RFI<-0.5 SD) vs. high RFI (RFI>0.5 SD) groups. Milk traits were recorded in 131 cows while CH4 and CO2 were measured in 83. Comparisons of –RFI vs. +RFI and low vs. high RFI showed 7.8% (22.3±0.40 vs. 24.2±0.39) and 12.9% (21.1±0.40 vs. 24.2±0.45) decrease (P<0.05) in DMI of –RFI and low RFI groups, respectively. Similarly, –RFI and low RFI cows had lower (P<0.05) CH4 (g/d) by 9.7% (343.5±11.1 vs. 380.4±10.9) and 15.5% (332.5±12.9 vs. 393.5±12.6) respectively. Milk yield was not different (P>0.05) in –RFI vs. +RFI and low vs. high comparisons. The –RFI and low RFI cows had lower (P<0.05) SCC in –RFI vs. +RFI and low RFI vs. high RFI comparisons. BHB was lower (P<0.05) in low RFI compared to the high RFI group. Low RFI dairy cows consumed less feed, emitted less methane (g/d), and had lower milk SCC and BHB without differing in milk yield.

Download Full-text