scholarly journals Increasing levels of concentrate digestibility, performance and ingestive behavior in lambs

2016 ◽  
Vol 17 (2) ◽  
pp. 186-194 ◽  
Author(s):  
Henrique Nunes PARENTE ◽  
Michelle de Oliveira Maia PARENTE ◽  
Ruan Mourão da Silva GOMES ◽  
Wesclley de Jesus dos Santos SODRÉ ◽  
Miguel Arcanjo MOREIRA FILHO ◽  
...  
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Block Design ◽  
Average Daily Gain ◽  
Protein Digestibility ◽  
Neutral Detergent Fiber ◽  
Ingestive Behavior ◽  
Dry Matter Intake ◽  
Gross Margin ◽  
Dry Matter Digestibility

SUMMARY The objectives of this research were to determine the effects increasing levels of concentrate on nutrients digestibility, performance, economic viability of diets and ingestive behavior of lambs. Fifteen crossbred lambs were used in a randomized complete block design according to initial body weight and age. Lambs were penned individually during 55 days, being 10 days for adaptation of diets and 45 days for data collection. The treatments consisted in three isonitrogenous diets with increasing levels of concentrate: 40, 60, or 80%, in dry matter basis. No effect (P>0.05) were observed on dry matter intake, crude protein intake, crude protein digestibility and neutral detergent fiber digestibility, whereas the dry matter digestibility was lower (P<0.01) for lambs fed diets with 40% of concentrate. The addition of 80% concentrate decreased (P<0.05) neutral detergent fiber intake, however this treatment provided higher average daily gain, followed by 60 and 40% of concentrate. In relation to feeding behavior, the animals fed80% concentrate spent more time with feeding (P<0.05) compared to the other treatments. It is concluded that supplementation of concentrate between 60 to 80% improves dry matter digestibility and performance of crossbred lambs without relevant affect dry matter intake and ingestive behavior. A diet with 80% concentrate provides positive gross margin of profit.

Effects of feeding wheat straw and middlings ensiled with whey on digestibility and growth of cattle

2005 ◽  
Vol 85 (1) ◽  
pp. 69-74 ◽  
Author(s):  
D. R. ZoBell ◽  
E. K. Okine ◽  
K. C. Olson ◽  
R. D. Wiedmeier ◽  
L. A. Goonewardene ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Dry Matter ◽  
Average Daily Gain ◽  
Corn Silage ◽  
Neutral Detergent Fiber ◽  
Dry Matter Intake ◽  
Dry Matter Digestibility ◽  
Alfalfa Hay ◽  
Growing Cattle ◽  
Wheat Middlings

Two studies were conducted with the objective of evaluating the effects of feeding different levels of whey ensiled with wheat straw and wheat middlings (whey silage) compared to control diets on production parameters in growing cattle. Whey silage was included in diets at 55 and 65.5% on a dry matter basis with net energy for maintenance and crude protein calculated to be similar to control diets containing a combination of alfalfa hay, corn silage and wheat middlings at 1.74 Mcal kg-1 and 13.4%, respectively. Dry matter intake averaged 8.41 versus 8.91 kg d-1 (P < 0.05) and 8.68 versus 7.09 kg d-1 (P < 0.05) when whey silage was included at either 55 or 65.5% of the diets compared to the control diets. Average daily gains of cattle fed whey silage incorporated at 55% was 1.00 versus 1.14 kg d-1 (P < 0.05), and reflected the difference in dry matter intake; no differences (P > 0.05) in feed efficiency (8.73:1 versus 8.71:1) were observed. However, the higher dry matter intake (DMI) of cattle fed diets with whey silage incorporated at 65.5% did not (P > 0.05) translate into higher average daily gain (1.23 versus 1.18 kg d-1), resulting in a higher (P < 0.05) feed to gain (7.00:1 versus 6.01:1) for the whey-based silage diets. Incorporation of whey silage in diets at 55% increased (P > 0.05) the dry matter digestibility by 12%, whereas incorporation at 65.5% decreased (P < 0.05) dry matter digestibility by 12% compared to control diets, with no differences (P > 0.05) in percent neutral detergent fiber digestibility (NDFD) at either level. We conclude that whey silage can be included at between 55 and 65.5% of the total dry matter in diets with no adverse effects on production compared to cattle fed diets containing a combination of alfalfa hay, corn silage and wheat middlings. Key words: Agricultural by products, crop residues, digestibility, growing cattle, production, whey silage

scholarly journals Digestive parameters during gestation of Holstein heifers

2020 ◽  
Author(s):  
Jéssica Marcela Vieira Pereira ◽  
Marcos Inácio Marcondes ◽  
Sebastião de Campos Valadares Filho ◽  
Joel Caton ◽  
Anna Luiza Lacerda Sguizzato ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Body Weight ◽  
Organic Matter ◽  
Crude Protein ◽  
Dry Matter ◽  
Average Daily Gain ◽  
Repeated Measurements ◽  
Neutral Detergent Fiber ◽  
Dry Matter Intake ◽  
Esterified Fatty Acids

AbstractOur objective was to estimate nutrient intake, ruminal flow, total apparent and ruminal digestibility, rates of passage and digestion, ruminal and omasal pH, blood metabolite concentrations, and body measurements during gestation of Holstein heifers. Eleven pregnant Holstein heifers, 8 of which fitted with a rumen cannula (450 ± 27.6 kg of body weight and 20 ± 3.5 months of initial age) were used. All heifers received the same diet composed of corn silage, soybean meal, corn meal, minerals and vitamins, with a corn silage:concentrate ratio of 50:50 (on a dry matter basis), aiming an average daily gain of approximately 1.0 kg. The sampling periods were established according to the days of gestation: 145, 200, and 255 with a duration of 10 days per period. Total fecal samples were collected to estimate dry matter, organic matter, crude protein, and neutral detergent fiber digestibility. Blood samples were collected to analyze metabolites (non-esterified fatty acids, β-hydroxybutyrate, urea, and glucose). Data were analyzed as a repeated measurements scheme, using MIXED procedure, with differences declared when P < 0.05. Dry matter intake expressed in kg/day increased from d-145 to d-200, and remaining stable until d-255 of gestation. The same results were observed for organic matter and crude protein intake, increasing 15.0 and 35.8% respectively. In contrast, when dry matter intake was evaluated as % body weight, we observed a decrease of 16.7% from d-200 to d-255. Days of gestation did not influence ruminal flow of dry matter, organic matter, crude protein, and neutral detergent fiber. We observed an increase in the ruminal digestibility of neutral detergent fiber by 20.5%. The apparent total-tract digestibility of dry matter, organic matter, and crude protein changed over days of gestation, with an increase of 11.9, 8.5, and 9.8%, respectively, when comparing d-145 with d-200. The rate of digestion of neutral detergent fiber increased from 2.0 to 3.5% h-1. Glucose levels decreased, while β-hydroxybutirate and non-esterified fatty acids increased from d-145 to d-255. In conclusion, our results demonstrate a reduction in dry matter intake in % body weight due to pregnancy. It also shows an increase in total apparent digestibility through gestation, which imply a greater efficiency of use of nutrients by pregnant animals. Thus, further research is still needed to consolidate such results and to elucidate the mechanism about nutrient usage during the final third of gestation in heifers.

scholarly journals Mineral supplementation of dairy heifers in Marandu-Grass pasture in spring and summer seasons

2020 ◽  
Vol 21 ◽  
Author(s):  
Carlos Augusto de Almeida Targino ALCOFORADO ◽  
Aianne Batista LIRA ◽  
Carla Giselly de SOUZA ◽  
Edson Mauro dos SANTOS ◽  
Safira Valença BISPO ◽  
...  
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Neutral Detergent Fiber ◽  
Dry Matter Intake ◽  
Ether Extract ◽  
Dairy Heifers ◽  
Dry Matter Digestibility ◽  
Mineral Supplementation ◽  
Tropical Grasslands ◽  
The Difference

ABSTRACT Here in this study we assessed dairy heifers kept in tropical grasslands during spring and summer seasons to observe the effects of two supplementation strategies upon their performance. Sixteen dairy heifers (Holstein 5/8 x Gyr 3/4) with 135.25 kg of body mass were randomly assigned in two supplementation treatments (e.g., mineral salt and protein salt supplement) during spring and summer seasons, divided into two groups of eight animals that represented 4.29 animal unit ha. Initial and final fasted weights (i.e., feed and water withheld for 16h) were obtained before to start and at the end of each grazing cycle (28 days), and then the weight gain (kg animal-1) per grazing cycle was calculated by the difference between final and initial weights. There was no significant effect (P <0.05) on the intake of dry matter, crude protein, ether extract, neutral detergent fiber, and dry matter digestibility, between treatments (P <0.05). However, there was a significant effect (P <0.05) between seasons; e.g., respective means of dry matter intake (kg day-1,% BW g / kg 0.75), intake of crude protein (g day-1 g / kg 0.75), ether extract (g day-1), neutral detergent fiber (g day-1 and% BW) were 3.95 and 2.88 kg, 2.54 and 1.65%, 89.27 and 59.56 g kg0.75, 429.89 and 298.43 g day-1, 9.72 and 6.18 g kg0.75, 118.79 and 84.07 g day-1, 2.90 and 2.05 kg day-1, 1.86 and 1.18%, for Spring and Summer seasons. Moreover, the dry matter intake (% BW and g kg 0.75 of DM) were higher (P < 0.05) during the spring season (e.g., 2.53 vs 1.64 % BW; and 89.26 vs 59.56 g kg0.75 DM).

scholarly journals Self-fed Supplements of Low and Medium Intake for Beef Steers Finished on Pasture

2021 ◽  
Author(s):  
Saimon de Souza Souza ◽  
Régis Luis Missio ◽  
Wagner Paris ◽  
Jefferson Felipe Cavazzana ◽  
Marcelo Machado Severo ◽  
...  
Keyword(s):  
Body Weight ◽  
Dry Matter ◽  
Nutritive Value ◽  
Average Daily Gain ◽  
Latin Square ◽  
Nutrient Digestibility ◽  
Ingestive Behavior ◽  
Dry Matter Intake ◽  
Dry Matter Digestibility ◽  
Randomized Design

Abstract The obstacles of using supplementation are related to the cost and labor. Self-fed supplements of low and medium intake can be an option to overcome these problems. However, the nutritive value and pasture yield are crucial to finding the right composition and amount of supplement. We evaluated productive responses of steers receiving self-fed supplements of low and medium intake on Aruana grass pasture. The animal performance, ingestive behavior, and pasture characteristics were evaluated in a completely randomized design with three treatments and three replicates. Twenty-four Aberdeen Angus steers were used as the tester animals. The dry matter intake and nutrient digestibility were evaluated in a 3 x 3 double Latin square repeated over time. The treatments consisted of mineral salt (control), supplementation for intake of 1.5 g/kg body weight (low-intake), and supplementation for intake of 4.0 g/kg body weight (medium-intake). The supplements did not influence the pasture characteristics and ingestive behavior, except the number of bites/day that was higher for the low-intake. Dry matter digestibility and forage intake were not affected by the supplementation, but the total dry matter intake increased for the medium-intake. The average daily gain, stocking rate, and fat thickness gain were higher for the medium-intake. The self-fed supplements of medium-intake increase the total dry matter intake, maximizing the performance of steers on Aruana grass.

scholarly journals KONSUMSI DAN KECERNAAN JERAMI JAGUNG MANADO KUNING DAN JERAMI JAGUNG HIBRIDA JAYA 3 PADA SAPI PO

ZOOTEC ◽  
2015 ◽  
Vol 35 (2) ◽  
pp. 328
Author(s):  
Nancy W.H. Tuwaidan ◽  
M. R. Waani ◽  
Rustandi - ◽  
S. S. Malalantang
Keyword(s):  
Key Words ◽  
Crude Protein ◽  
Dry Matter ◽  
Neutral Detergent Fiber ◽  
Dry Matter Intake ◽  
Corn Straw ◽  
Hybrid Corn ◽  
Second Stage ◽  
Dry Matter Digestibility ◽  
Yellow Corn

ABSTRACT INTAKE AND DIGESTIBILITY OF YELLOW MANADO AND JAYA 3 HYBRID CORN SRAWS FOR ONGOLE GRADE CATTLE. Experiment was conducted to determine the intake capacity and digestibility of Manado yellow corn straw (MYCS) and Jaya 3 hybrid corn straw (J3HCS) as single feed for Ongole grade cattle (OGC). Five female OGC were used in this experiment, applied into two periods. The animals were fed with MYCS in the first stage and J3HCS in the second stage. The measured variables were including dry matter intake (DMI), dry matter digestibility (DMD), digestibility of crude protein (DCP) and digestibility of Neutral Detergent Fiber (DNDF). The data were analyzed by T test. The results showed that treatment significantly affected (p <0.05) the DMI, DMD, DCP and DNDF. It can be concluded DMI, DMD, DCP and DNDF of MYCS were higher than those of J3HCS.   Key words: Dry matter Intake, Digestibility, Corn straw, Ongole grade cattle.  

EFFECT OF ONE CYCLE OF DIVERGENT PHENOTYPIC SELECTION FOR CRUDE PROTEIN, DIGESTIBILITY AND DIGESTIBLE YIELD IN TIMOTHY

1990 ◽  
Vol 70 (3) ◽  
pp. 757-765 ◽  
Author(s):  
J. SURPRENANT ◽  
R. MICHAUD ◽  
G. ALLARD
Keyword(s):  
Significant Variation ◽  
Crude Protein ◽  
Dry Matter ◽  
Nutritive Value ◽  
Phenotypic Selection ◽  
Protein Digestibility ◽  
Phleum Pratense ◽  
Neutral Detergent Fiber ◽  
Dry Matter Intake ◽  
Selection For

A major goal in the breeding of timothy (Phleum pratense L.) is to improve its nutritive value. The objective of this study was to evaluate the effects of one cycle of divergent phenotypic selection for crude protein, digestibility and digestible yield. The progeny of genotypes selected either for high or low crude protein, high or low digestibility, and high or low digestible yield along with a subpopulation representing the unselected original parents were evaluated for dry matter yield and several forage quality characteristics under spaced plant and sward conditions. Under spaced plant conditions significant variation was observed for digestibility (IVDMD), crude protein (CP), acid detergent fiber (ADF) and neutral detergent fiber (NDF). Under sward conditions, significant variation was observed for water retention (WR), ADF and NDF. Under spaced plant conditions, a priori contrasts indicated that one cycle of selection was sufficient to create distinct populations for CP in selecting for CP, for IVDMD and ADF with the IVDMD selection and in 2 out of 3 yr for digestible yield with selection for digestible yield. Evaluation under sward conditions indicated that selection for digestible yield modified CP, WS, ADF, NDF, PV and WR. The results from the evaluation under sward conditions were used to compute different parameters related to potential animal production such as dry matter intake, lactation net energy, energy intake, and different estimates of potential milk production that could be obtained from feeding this hay.Key words: Phleum pratense, timothy, quality, dry matter intake

scholarly journals Effect of zinc sources and experimental conditions on zinc balance in growing wethers

2022 ◽  
Author(s):  
C Lee ◽  
J E Copelin ◽  
M T Socha
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Block Design ◽  
Latin Square ◽  
Basal Diet ◽  
Neutral Detergent Fiber ◽  
Dry Matter Intake ◽  
Experimental Conditions ◽  
Randomized Block Design ◽  
Zinc Balance

Abstract Three experiments were conducted with growing wethers to evaluate apparent excretion and retention of Zn from various sources. In Exp. 1 and 2, Zn-ethylene diamine (ZE), Zn hydroxychloride (ZHYD), Zn-lysine/glutamate (ZAA), and Zn-glycinate (ZG) were used and ZnSO4 (ZS), Zn hydroxychloride (ZHYD), Zn-lysine/glutamate (ZAA), and Zn-glycinate (ZG) were used in Exp. 3. In Exp. 1, 8 wethers were used in a replicated 4 × 4 Latin Square design. In Exp. 2 and 3, 40 wethers were used in a randomized block design. In Exp. 1, each period (total 4 periods) consisted of 14-day diet adaptation and 4 days of total collection of feces and urine. In Exp. 2 and 3, wethers received a basal diet for 14 days and received experimental diets for 9 days (diet adaptation), followed by 4 days of total collection of feces and urine. Total collection was conducted in wooden metabolic cages. All data were analyzed using the MIXED procedure of SAS as a Latin square design for Exp. 1 and a completed randomized block design for Exp. 2 and 3. In all experiments, dry matter intake did not differ among treatments except that it tended to be different in Exp. 2. In Exp. 1, no difference in Zn excretion (88%) and retention (11%) as proportion of Zn intake was observed among Zn sources. In Exp. 2, total tract digestibility of crude protein was greater (P &lt; 0.01) for ZAA than ZE and ZG (82.0 vs. 79.1 and 77.8%, respectively) and greater (P &lt; 0.01) for ZHYD than ZG (80.2 vs. 77.8%). However, total tract digestibility of neutral detergent fiber was low (on average 16%) for all treatments with no difference among treatments in Exp. 2. Apparent excretion and retention of Zn as proportion of Zn intake did not differ among treatments, and Zn retention (~1.4% of Zn intake) was very low for all treatments. In Exp. 3, ZHYD and ZAA had greater retention of Zn (17.8 vs. 1.5%; P = 0.01) than ZG. Fecal Zn excretion was greater (97.3 vs. 81.2%; P = 0.01) for ZG vs. ZHYD and ZAA, and Zn retention for ZG was only 1.5% of Zn intake. In conclusion, potential increases in Zn absorption and retention were observed for ZHYD and ZAA compared with ZS and ZG in Exp. 3 and these differences were not found in Exp. 1 and 2. Experiment 1 used a Latin square design and Exp. 2 used a diet containing largely undigestible fiber. These experimental conditions may have affected Zn metabolism in wethers. Inconsistent results on Zn balance for ZG among the experiments warrant further studies regarding its bioavailability.

scholarly journals The Performance of Steers Fed on Sugarcane in natura or Ensiled with Concentrate

2017 ◽  
Vol 9 (3) ◽  
pp. 226
Author(s):  
Dheynne Alves Vieira ◽  
Andréia Santos Cezário ◽  
Wallacy Barbacena Rosa dos Santos ◽  
Jeferson Corrêa Ribeiro ◽  
Tiago Neves Pereira Valente ◽  
...  
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Neutral Detergent Fiber ◽  
Dry Matter Intake ◽  
Daily Weight Gain ◽  
Zebu Cattle ◽  
Feed Conversion ◽  
Average Daily Weight Gain ◽  
High Dry Matter ◽  
Randomized Experimental Design

The aim of this study was to evaluate the performance of crossbred Holstein × Zebu steers fed on the diets containing sugarcane in natura or ensiled with two levels of concentrate (30% and 70%). A total of 32 males of 394 kg of body weight were used in a completely randomized experimental design with four treatments and seven repetitions. The animals reported a high dry matter intake (DMI) (P < 0.05) when fed on the high concentrate levels. The increase in concentrate levels resulted in an approximately 25% to 60% higher DMI as compared to the lowest level offered by silage-based diets and sugarcane in natura. The highest apparent digestibility coefficients of dry matter were observed in the diets based on sugarcane in natura (P < 0.05). The sugarcane based diets also affected (P > 0.05) the digestibility of organic matter, neutral detergent fiber, crude protein, ether extract, and non-fiber carbohydrates. There were no differences (P > 0.05) between the diets for average daily weight gain, carcass dressing, carcass gain, and feed conversion. The diets based on sugarcane in nature or ensiled with 30% and 70% concentrates do not influence the performance of crossbred Holstein × Zebu cattle.

Dry matter intake, nutrient selection and milk production of dairy cows grazing rainfed perennial pastures at different herbage allowances in spring

1999 ◽  
Vol 39 (8) ◽  
pp. 923 ◽  
Author(s):  
P. J. Moate ◽  
D. E. Dalley ◽  
J. R. Roche ◽  
C. Grainger
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Crude Protein ◽  
Dry Matter ◽  
Dry Matter Intake ◽  
Neutral Detergent Fibre ◽  
Dry Matter Digestibility ◽  
Herbage Intake ◽  
Selection Differentials

Summary. The effect of herbage allowance (20, 30, 40, 50, 60 and 70 kg DM/cow. day) on the consumption of nutrients from herbage and milk production by cows in early lactation, was examined. The experiment was conducted on rainfed perennial ryegrass pastures in September and October 1997 in south-eastern Victoria, Australia. The herbage on offer comprised 64% perennial ryegrass, 21% other grasses, 1% white clover, 5% weeds and 9% dead material on a dry matter (DM) basis. The average pregrazing herbage height was 13 cm, at an estimated pregrazing herbage mass of 3.6 t DM/ha. The herbage on offer was of high quality containing 11.6 MJ metabolisable energy/kg DM, 202 g crude protein/kg DM and 525 g neutral detergent fibre/kg DM. Concentrations of calcium, magnesium, sodium, potassium, phosphorus, sulfur and chloride were 4.4, 2.2, 4.4, 31.2, 3.5, 2.7 and 11.4 g/kg DM, respectively. As daily herbage allowance per cow increased, dry matter intake increased curvilinearly (P<0.01) from 11.2 to 18.7 kg DM/cow. day. This was associated with a decrease in utilisation of herbage from 54 to 26% and an increase in milk production from 25.9 to 29.1 kg/cow. day. The cows on all treatments grazed for less than 8.7 h/day. The increase in intake was achieved by an increase in the rate of herbage intake from 1.5 to 2.2 kg DM/h for herbage allowances of 20 and 70 kg/cow.day, respectively. Irrespective of herbage allowance, cows selected a diet that was approximately 10% higher in in vitro dry matter digestibility and 30% higher in crude protein than that in the herbage on offer. The neutral detergent fibre content of the herbage selected was lower (P<0.05) than that on offer. The herbage consumed contained more (P<0.05) magnesium, potassium and sulfur, the same amount of calcium and phosphorus and less (P<0.05) sodium and chloride than the herbage on offer. For rainfed perennial pastures in spring, herbage allowance is an important factor in determining voluntary feed intake and production of dairy cows. To achieve 30 L from herbage, without supplementation, high herbage allowances are required. The increase in herbage intake, with increasing herbage allowance, resulted from an increase in rate of dry matter intake and not an increase in grazing time. No relationship was evident between herbage allowance and the selection differentials for in vitro dry matter digestibility, crude protein and neutral detergent fibre. Selection differentials for rainfed perennial pastures in spring are similar to those reported for irrigated perennial pastures in northern Victoria in spring and autumn. When determining nutrient requirements it is important to consider the interaction between herbage intake and nutrient concentration in the herbage.

scholarly journals PSIV-3 Effect of winter-feeding system and roughage level in feedlot ration on subsequent spring grazing behavior and dry matter intake of beef growing heifers

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 228-229
Author(s):  
María Victoria Burjel ◽  
Alvaro Simeone ◽  
Oscar Bentancur ◽  
Natalia Zabalveytia ◽  
Virginia Beretta
Keyword(s):  
Repeated Measures ◽  
Dry Matter ◽  
Block Design ◽  
Ingestive Behavior ◽  
Dry Matter Intake ◽  
Feeding System ◽  
Grazing Behavior ◽  
Randomized Block Design ◽  
Winter Feeding

Abstract This study aimed to evaluate the effect of winter-feeding system (grazing, GFS vs. feedlot, FFS) and ration roughage level (RL), on subsequent spring grazing behavior and forage dry matter intake (DMI). Thirty-two Hereford female calves (149 ± 13 kg) were assigned to four winter dietary treatments (110 days) in a randomized block design (n = 2/treatment): three feedlot rations differing RL (Setaria italica) (0%, 35% or 70% DM) or oats grazing (5 kg DM/100 kg LW). In spring (84 days) all treatments grazed a mixed grass-legume pastures (4317 ± 1009 kg DM/ha; 6 kg DM/100 kg LW). During weeks 1, 3 and 5 after changing diets, diurnal behavior activity (effective/search grazing, rumination, idling or water intake) was visually recorded and DMI estimated from the in vivo DM digestibility (DMD) and fecal production. Data were analyzed according to a block design with repeated measures, with general model including block, treatment (T), week (W) and T×W effects. Means were compared through orthogonal contrasts (Table 1). Spring DMI varied with T (P = 0.0084) regardless of W effect (P = 0.1619), with higher values for GFS compared to FFS (1.55 vs. 1.16 kg/100 kg LW, P = 0.0034) and for 70RL compared to 35RL (P = 0.0286). DMD did not differ between treatments (P = 0.2488) but was lower on W1 than W5 (55 vs. 64 %, P = 0.0150). T×W was significant (P &lt; 0.0001) for effective grazing, rumination and idling. On W1, heifers from GFS grazed less (0.40 vs. 0.49, P = 0.0268) but tended to ruminate more (0.26 vs. 0.18, P = 0.0591) than FFS. As pasture DMD improved (W5) GFS grazed more (0.64 vs. 0.51, P = 0.0020) but ruminated less (0.14 vs. 0.21, P = 0.0450) than FFS. Transition from FFS to spring grazing might reduce pasture DMI modifying animal ingestive behavior compare to animals from GFS. Impact could be higher when ration RL is below 70%.

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