Amir Akbari Afjani; Abolfazl Zali; Mehdi Ganjkhanlou; Mehdi Dehghan Banadaki
Volume 42, Issue 3 , January 2011, , Pages 247-253
Abstract
The effect of different levels of alfalfa hay and corn silage, in early lactation diet, on milk production and on milk components in Holstein cows was investigated. Fifteen Holstein cows (37 ±10 DIM) were taken in a completely randomized design experiment, lasting for 9 weeks. Three levels of hay and ...
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The effect of different levels of alfalfa hay and corn silage, in early lactation diet, on milk production and on milk components in Holstein cows was investigated. Fifteen Holstein cows (37 ±10 DIM) were taken in a completely randomized design experiment, lasting for 9 weeks. Three levels of hay and corn silage namely: 1) 10% alfalfa -30% silage corn (Diet 1), 2) 20% alfalfa -20% silage corn (Diet 2) and 3) 30% alfalfa -10% silage corn (Diet 3) former the treatments. The ratio of forage to concentrate was taken as the same (40: 60) in all the treatments. Cows were fed in Total Mixed Rations (TMR) and twice daily. They were milked 3 times a day at 02:00, 10:00, and 18:00 h. Milk production was recorded at each milking, but milk composition was weekly determined. Dry matter intake for each cow was daily assessed. Dry matter intake was higher (P0.05). Blood parameters were not seriously affected by dietary treatments (P>0.05), although glucose content for Diet 1 was higher than that for Diet 2.
Ata Mahdavi; Kamran Reza Yazdi; Ahmad Zare Shahneh; Mahdi Dehghan Banadaki
Volume 41, Issue 2 , September 2010
Abstract
The aim of this experiment was to study the effect of Conjugated Linoleic Acid (CLA) supplement on milk yield, milk composition,energy balance and blood metabolites of Holstein cows in their early lactation. Fifteen multiparous lactating Holstein cows (20±3 DIM, 637±8 kg initial BW) were blocked by ...
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The aim of this experiment was to study the effect of Conjugated Linoleic Acid (CLA) supplement on milk yield, milk composition,energy balance and blood metabolites of Holstein cows in their early lactation. Fifteen multiparous lactating Holstein cows (20±3 DIM, 637±8 kg initial BW) were blocked by milk production, and assigned in a completely randomized block design to 1 of 3 treatments, namely: 1) control (basal diet+115g/d Ca salts of palm fatty acids), 2) Rumen protected CLA (basal diet+120g/d of lipid encapsulated CLA), and 3) Rumen unprotected CLA (basal diet+40g/d rumen unprotected CLA). Doses provided a total of 96g of fatty acids per day. Dry matter intake and milk yield were recorded daily. Milk composition, body weight and body condition score were measured weekly during the 35 days of the experiment. Blood samples were collected twice in days 14 and 35 of experiment. Results indicated that rumen protected CLA supplement reduced milk fat content by 17.8% as compared with control (P
Hadi Fagari Nobijari; Hamid Amanlou; Mehdi Dehghan Banadaki; Seyed Hosein Hoseini Sabeghi; Khosro Ghazvinian
Volume 41, Issue 1 , May 2010
Abstract
Three hundred eighteen young Holstein bulls (initial BW = 375 ± 17.5 kg) were randomly allotted to one of six treatments in a completely randomized design for 56 d the treatments of which consisted of 1) the basal diet (control); 2) basal diet plus 30 mg of Cu/kg of DM as CuSO4; 3) basal diet plus 150 ...
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Three hundred eighteen young Holstein bulls (initial BW = 375 ± 17.5 kg) were randomly allotted to one of six treatments in a completely randomized design for 56 d the treatments of which consisted of 1) the basal diet (control); 2) basal diet plus 30 mg of Cu/kg of DM as CuSO4; 3) basal diet plus 150 mg of Zn/kg of DM as ZnSO4; 4) basal diet plus chlortetracycline (200 mg/animal/d; CTC); 5) basal diet + Cu + CTC; and 6) basal diet + Zn + CTC within the same dose. Effects of treatments on blood metabolites and Back fat thickness, Rump fat thickness, Longissimus muscle area and Hip height were evaluated. Serum urea nitrogen (P < 0.001) and plasma total protein (P < 0.001) were different among treatments. Copper supplementation improved ultrasound index, however, zinc supplementation negatively affected (P < 0.001). As a result, the control of Cu and Zn levels, as replacers for CTC, in the diet of young bulls can increase Longissimus muscle area and can decrease fat thickness.
Mehdi Kazemi Benchenari; Kamran RezaYazdi; Ali Nikkhah; Hamid Kohram; Mehdi Dehghan Banadaki; MohammadReza Emami
Volume 40, Issue 4 , March 2010
Abstract
This experiment was conducted to study the effects of Peptide Nitrogen Source (PNS) infusion on ruminal fermentation pattern, nutrient digestibility, and microbial nitrogen production. Three ruminally cannulated Holstein dairy cows BW=682 kg and DIM=210d were assigned in a 3×3 Latin Square of 21-d periods. ...
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This experiment was conducted to study the effects of Peptide Nitrogen Source (PNS) infusion on ruminal fermentation pattern, nutrient digestibility, and microbial nitrogen production. Three ruminally cannulated Holstein dairy cows BW=682 kg and DIM=210d were assigned in a 3×3 Latin Square of 21-d periods. The first 14 d’s were considered as adaptation period and the last 7 d as sample collection period. Three levels of sodium caseinate as PNS were used in the experiment (0, 50 and 100gr/d considered as diets 1, 2 and 3 respectively). PNS was infused directly into rumen of the fistulated cows just before the offer of morning diet. Purine derivatives method was ebpolyed for daily microbial nitrogen synthesis estimation. Ruminal Ammonia Nitrogen (NH3-N) and Peptide Nitrogen (Pep-N) concentrations (P
Mehdi DehghanBanadaki; Heshmatolah Bahrami
Volume 40, Issue 3 , December 2009
Abstract
Fifty six Holstein lactating cows (71 days in milk; 35 Kg/day milk production) were employed in a complete block randomized design of repeated measurements. Cows were randomly allocated to two treatments based on their parity. Cows in group 1 were fed a balanced total mixed ration (600 g concentrate ...
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Fifty six Holstein lactating cows (71 days in milk; 35 Kg/day milk production) were employed in a complete block randomized design of repeated measurements. Cows were randomly allocated to two treatments based on their parity. Cows in group 1 were fed a balanced total mixed ration (600 g concentrate /kg DM and 400 g forages /kg DM) with 50 g Rumen Protected Methionine (RPM) per head per day (Methioplus 55%), while cows in group 2 were fed TMR without additive (control group). The experimental period was 40 days with 10 initial days for adaptation. RPM had no effect on milk production, milk composition and dry matter intake. Milk composition namely fat, protein, lactose, solid non fat and total solid percentage did not change by treatment (P>0.05). Cows treated with RPM bore a higher concentration of plasma glucose, and a lower plasma concentration of nonesterified fatty acids (NEFA; P
heshmat-o-lah bahrami yekdangi; kamran rezayazdi; mehdi dehghan banadaki; ardeshir nejati javaremi
Volume 40, Issue 2 , September 2009
Abstract
The effects of Monesin and propylene glycol on feed intake, milk production, and composition as well as some blood metabolites of 16 primiparous and multiparous Holstein lactating cows (60±30 Days In Milk (DIM), milk production of 33±3 Kg/day) were evaluated. Cows were experimentally in a arranged ...
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The effects of Monesin and propylene glycol on feed intake, milk production, and composition as well as some blood metabolites of 16 primiparous and multiparous Holstein lactating cows (60±30 Days In Milk (DIM), milk production of 33±3 Kg/day) were evaluated. Cows were experimentally in a arranged in a randomized complete block design of: 4 feeding treatments, and 2 blocks of either primiparous or multiparous. They were fed a balanced total mixed ration of 60% concentrate and 40% forages (with or without additives). Cows in group I were fed Total Ixed Ration (TMR) with no additives (control). Cows in group ? were fed TMR with 335 mg/head/day Monensin. Cows in group ? were fed TMR with 400 ml/head/day of propylene glycol, and finally cows in group IV were fed TMR with 335 mg/head/day of monensin and 400 ml/head/day of propylene glycol. Daily milk yield, milk composition and some blood metabolites were recorded. Data were analyzed using mixed models for repeated measurements. The experimental treatments did not affect either feed intake or milk composition, but propylene glycol caused significant increase in cows' milk yield (P
mehdi ganj khanloo; kamran reza yazdi; gholam reza ghorbani; hossein moravej; mehdi dehghan banadaki; mohammad reza emami
Volume 40, Issue 1 , June 2009
Abstract
This study was conducted to evaluate production response of early lactating cows to rumen protected fats. Twelve (nine multiparous and three primiparous) Holstein cows (26±4 d in milk) were empolyed in a replicated 3×3 Latin Square Design of 21-d periods. Each period consisted of 14 days of adaptation ...
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This study was conducted to evaluate production response of early lactating cows to rumen protected fats. Twelve (nine multiparous and three primiparous) Holstein cows (26±4 d in milk) were empolyed in a replicated 3×3 Latin Square Design of 21-d periods. Each period consisted of 14 days of adaptation and 7 days of sampling. Cows received diets containing either one of two types of protected fats or no supplemental fat. Cows in group 1 (control) were fed Total Mixed Ration (TMR) of 20% corn silage, 20% alfalfa hay, and 60% concentrate mix. Cows in group 2 were fed the TMR containing 3% prilled protected fat (Energizer-10). Cows in group 3 were fed the TMR containing 3.5% Ca salt of protected fat (Magnapac). Intake of Dry Matter (DM), Organic Matter (OM) and Neutral Detergent Fiber (NDF) were decreased by rumen protected fat (P < 0.05) in multiparous cows (DMI: 25.7, 24.1, and 23.9 kg/d for control, prilled fat, and ca salt of fat, respectively); intake of NEL in all the cow population and intake of DM, OM and NDF in primiparous cows were similar for all diets (P > 0.05). Production of milk and 3.5% FCM in primiparous and multiparous cows as well as milk protein, fat, lactose and total solid percentages and yields (kg/d) were not affected by fat supplements (P > 0.05). The BCS and BW changes were similar for all diets in multiparous and primiparous cows (P > 0.05). In multiparous cows, feed efficiency (3.5% FCM/DMI) was higher for cows fed supplemental fat diets (P < 0.05) than for control samples. Fat fed cows were more efficient than those fed with control diet. In primiparous cows supplemental fat did not influence feed efficiency (P > 0.05). Fat supplements did not influence either chewing behavior or total time spent ruminating and eating (P > 0.05). The results indicate that supplementation of early lactating diet with rumen protected fat decreases feed intake and improves milk efficiency but this is not true for primiparous cows.
