فهرس المقالات fresh cow

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  1 - Performance, Metabolic Responses of Fresh Cows to Daily or Every Other Day Oral Drenching a Glucogenic Precursor
  م. کاظمی بن چناری م. جهانی مقدم ع.ر. علیزاده پ. قدرتی ح. شهابی ا. محجوبی م. گرجی دوز
  The delivery method of [continuous (CONT) vs. every other day or intermittent (INT)] a glucogenic precursor (GP) which was contained glycerin (500 g/kg), mono-propylene glycol (250 g/kg), calcium propionate (150 g/kg), niacin (1 g/kg) and sulfate-Co (350 mg/kg) on perfo أکثر

  The delivery method of [continuous (CONT) vs. every other day or intermittent (INT)] a glucogenic precursor (GP) which was contained glycerin (500 g/kg), mono-propylene glycol (250 g/kg), calcium propionate (150 g/kg), niacin (1 g/kg) and sulfate-Co (350 mg/kg) on performance, selected blood metabolites and liver enzymes were evaluated. Twenty-four multiparous Holstein fresh cows were allocated in a completely randomized design (8 animals/each treatment) fed individually for a period of 14 days after calving. The experimental groups were: 1) no GP supplementation (CTR), 2) GP offered as an oral drench once a day (GP-CONT) on days 3, 4, 5, 6, and 7 after calving and 3) GP offered as an oral drench once a day intermittently (GP-INT) on days 3, 5, 7, 9, and 11 after calving. The amount of oral drenched GP was 1 kg/d. Blood samples were obtained on 5 and 14 days in milk. Dry matter intake (DMI) was increased (P=0.05) in GP-INT cows compared to GP-CONT but not control cows. The yield of fat corrected milk was greater in CTR cows than in GP supplemented cows (P=0.01). The milk protein and fat content were greater for GP-CONT and CTR groups, respectively. Milk somatic cell count was decreased in GP supplemented cows than in CTR cows (64.5 vs. 365×103/mL; P=0.02).Plasma total protein concentration was greater in GP-CONT group. Insulin concentration was increased for GP-CON animals on day 5 (P<0.05). Non-esterified fatty acids and β-hydroxy butyrate as well as liver enzymes were unaltered by treatments. However insulin sensitivity index was lower in supplemented treatments with GP rather than control group (P<0.05). In conclusion, the intermittent delivery of glucogenic precursor may be recommendable in fresh cows based on DMI criteria, which warrants further studies. تفاصيل المقالة
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  2 - The Effect of Partial Replacing Solvent Soybean Meal with Poultry Blood Meal on Performance and Metabolic Status of Fresh Holstein Dairy Cows
  I. Rahnama T. Amirabadi Farahani S. Karimi-Dehkordi
  The objective of this study was to investigate the effect of replacing solvent soybean meal (SSBM) with poultryblood meal (PBM) on performance, metabolic status, and apparent digestibility of nutrients in Holstein fresh cows. Twenty-four Holstein cows (body weight (BW)& أکثر

  The objective of this study was to investigate the effect of replacing solvent soybean meal (SSBM) with poultryblood meal (PBM) on performance, metabolic status, and apparent digestibility of nutrients in Holstein fresh cows. Twenty-four Holstein cows (body weight (BW)±SD; 669.5±42.59 kg) were blocked by body condition score (BCS) at calving and previous lactation milk yield and randomly assigned to 1 of 3 experimental diets from calving until 21 days in milk (DIM): diet without PBM (0PBM), replacing 2.5% DMSSBM with PBM (2.5PBM), and replacing 5% DMSSBM with PBM (5PBM). There were no significant effects (P>0.10) of treatments on dry matter intake (DMI), milk yield, and milk composition, but cows fed the 2.5PBM diets had significantlyhigher milk urea nitrogen (MUN) levels than cows fed the 0PBM and 5PBM diets (P<0.01). Cows fed the 5PBM diet had significantly higher serum globulin, non-esterified fatty acids (NEFA), and β-hydroxybutyrate (BHB) and lower serum cholesterol concentrations than cows fed the 0PBM and 2.5PBM diets (P<0.05). Blood urea nitrogen (BUN) concentration in cows fed the 2.5PBM diet was significantly(P=0.01) higher than cows fed the 0PBM and 5PBM diets. The apparent digestibility of dry matter in the 5PBM diet was significantly(P=0.03) lower compared to the 0PBM diet. However, there was no significant difference between the 5PBM and 2.5PBM diets. Overall,the lack of significant differences in performance, apparent digestibility of nutrients and serum metabolites between the 0PBM and 2.5PBM shows that the SSBM could replace up to 2.5% of DM with the PBM. However, levels higher than 2.5% of DM are not recommended due to low palatability and negative effects on the metabolic status of cows. تفاصيل المقالة
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  3 - Effects of Rumen Undegradable Protein on Productive Performance and N Balance of Holstein Cows in Early Post-Partum Period
  م. ابوذر ف. نیازی
  Metabolizable protein (MP) supply and amino acid balance were manipulated through selection of highly digestible rumen-undegradable protein (RUP) sources. Effects on production efficiency and N utilization of early post-partum dairy cows were determined. Forty-two multi أکثر

  Metabolizable protein (MP) supply and amino acid balance were manipulated through selection of highly digestible rumen-undegradable protein (RUP) sources. Effects on production efficiency and N utilization of early post-partum dairy cows were determined. Forty-two multiparous and 16 primiparous Holstein cows were assigned to the diets in a randomized complete block design immediately after parturition with 3-wk experimental periods, and then were fed a ration for 120 days in milk. Diets were formulated to provide 3 concentrations of dietary RUP (LRUP 6.65, MRUP 7.72 and HRUP 8.79% of dry matter (DM)) while rumen-degradable protein remained constant (11.3% of DM). Diets contained 26.30% alfalfa hay, 12.60% corn silage, 9.50% sugar beet pulp and 51.5% concentrate in DM basis. Ingredients within the diets were equal across treatments except for fish meal and corn gluten meal that partially replaced with steam rolled barley and soybean meal. Dry matter intake linearly increased by the treatments. Milk yield, Fat corrected milk (FCM) and protein content and yield increased significantly when cows were fed the diets with greater RUP, but milk fat and lactose was not different between treatments. Body weight (BW) changes was improved with intake of high RUP but Body condition score (BCS) changes had significant difference and improved by increasing RUP in the diet. The efficiency of N use increased linearly. Milk urea N and predicted urinary N increased linearly when cows were fed higher amounts of RUP, but differences between the control treatment and high RUP diets were not significant. Fecal N and N balance did not have significant difference. Total tract digestibility of DM and crude protein (CP) intakes increased significantly with greater RUP. In general, increasing amounts of MP and RUP improved productive performance and BCS status of fresh cows and enhanced digestibility of DM and CP. تفاصيل المقالة