Document Type : Research Paper

Authors

1 Coressponding Author, Department of Animal and Poultry Nutrition, Faculty of Animal Science, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran. E-mail: hamed_gholami_s98@gau.ac.ir

2 Department of Animal and Poultry nutrition, Faculty of Animal Science, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran. E-mail: ghoorchi@gau.ac.ir

3 Department of Animal and Poultry nutrition, Faculty of Animal Science, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran. E-mail: toghdory@gau.ac.ir

Abstract

Objective: Sorghum (Sorghum bicolor) is a forage crop grown in arid and semi-arid regions that can be used to produce green, dry and silage fodder. It is valued for high tillering, broad nutritional value, high yield and high-water use efficiency. Iran is a dry land in the world. It is not possible to grow forage throughout the year in this country. Therefore, more efficiently water use and tolerating harsh climate are needed. Sorghum is one of the major silo forage crops. The aim of this study was to investigate the effects of replacing corn silage with sorghum silage on digestibility, production performance, blood parameters, and feeding behaviors of Holstein dairy cows in mid-lactation.
Method: Eight lactating cows with average milk production of 34.5 ±3kg/day and average lactation days of (120±22) were assigned in a Latin square experimental design with 4 treatments and 8 replications (repeated in 4 21-day periods). The experimental treatments were zero (control), 33, 66, and 100 percent replacement of Single Cross 704 corn silage with Speedfeed sorghum silage. Cows were milked three times a day and the amount of milk produced for each cow at each milking was recorded.
Results: Dry matter percen of the  silage in this experiment was reported to be slightly higher for sorghum silage than  corn silage (20.20% for forage corn silage and 20.55% for forage sorghum silage), crude protein was (10.76% for corn silage and 8.17% for sorghum silage and the pH was approximately four.There was no significant difference in dry matter intake between treatments; milk production in the control treatment (100% corn silage) was significantly higher than the other treatments (P<0.05), but milk production efficiency (kilograms of milk produced per kilogram of dry matter consumed) was similar,milk fat percentage and fat to protein ratio were higher in the treatment with 100% sorghum silage than in the other treatments (P<0.05), andcrude protein digestibility, dry matter digestibility and NDF decreased with the replacement of corn silage with sorghum silage (P<0.05). Use of speed-feed sorghum silage increased (P<0.05) the levels of beneficial unsaturated fatty acids (ω6/ω3 and C16:0).
Conclusion: Overall, there wasa reduction in milk production and an increase in milk fat with 100% sorghum replacement, making sweet sorghum a promising forage option for dairy farms where corn is difficult to grow due to water shortages (a characteristic of hot and dry areas).

Keywords

هدایتی­پور، احمد؛ خوروش، محمد؛ قربانی، غلامرضا؛ المدرس، عباس و عبادی، محمدرضا (1391). مقایسه خصوصیات شیمیایی و تجزیه‌پذیری انواع علوفه و سیلاژ سورگوم با ذرت در شرایط ازمایشگاهی و روش کیسه‌های نایلونی. نشریه پژوهش‌های علوم دامی ایران، 4، 50-46.
شعبان، ولی محمد؛ باشتنی، مسلم؛ فتحی نسری، محمدحسن و نعیمی‌پور، حسین (1392). ﺗﻌﻴﻴﻦ ﺗﺮﻛﻴﺐ ﺷﻴﻤﻴﺎﻳﻲ و ﺗﺠﺰﻳﻪپذﻳﺮی ﺳﻮرگوم ﺳﻴﻠﻮﺷﺪه در دو ﻣﺮﺣﻠﻪ از رﺷﺪ ﺑﺎ اﺳﺘﻔﺎده از روش ﻛﻴﺴﻪﻫﺎی ﻧﺎﻳﻠﻮﻧﻲ. تحقیقات تولیدات دامی، 2 (2)، 55-65.
 

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