文献类型： 外文期刊

作者： Khan, Nadar ¹ ; Shah, Tawaf Ali ³ ; Akhtar, Hafiz Muhammad Saleem ³ ; Salamatullah, Ahmad Mohammad ⁴ ; Bourhia, Mohammed ⁵ ; Mekonnen, Amare Bitew ⁸ ; Khan, Muhammad Zahoor ⁶ ; Nazar, Mudasir ⁷ ; Khan, Nazir Ahmad ¹ ;

作者机构： 1.Univ Agr, Dept Anim Nutr, Peshawar 25130, Khyber Pakhtunk, Pakistan

2.Livestock & Dairy Dev Dept Res, Peshawar 25120, Khyber Pakhtunk, Pakistan

3.Shandong Univ Technol, Coll Agr Engn & Food Sci, Zibo, Peoples R China

4.King Saud Univ, Coll Food & Agr Sci, Dept Food Sci & Nutr, 11 POB 2460, Riyadh 11451, Saudi Arabia

5.Ibn Zohr Univ, Fac Sci, Lab Biotechnol & Nat Resources Valorizat, Agadir 80060, Morocco

6.Liaocheng Univ, Coll Agron, Liaocheng 252000, Peoples R China

7.Jiangsu Acad Agr Sci, Inst Anim Sci, Nanjing 210014, Peoples R China

8.Bahir Dar Univ, Dept Biol, POB 79, Bahir Dar, Ethiopia

关键词： Maize silage; Harvest maturity; Fermentation; Silage quality; Metabolizable energy; Carbohydrates subfractions

期刊名称：BMC PLANT BIOLOGY （ 影响因子：5.3； 五年影响因子：5.9 ）

ISSN： 1471-2229

年卷期： 2024 年 24 卷 1 期

页码：

收录情况： SCI

摘要： The aim of the experiment was to evaluate the potential of promising summer maize genotypes and optimal stage of harvesting these genotypes for ensiling in terms of dry matter (DM), starch, and crude protein (CP) yields, silage fermentation quality, nutrients profile, total digestible nutrients, metabolizable energy (ME) content, Cornell Net Carbohydrate and Protein System (CNCPS) carbohydrate (CHO) subfractions composition, in vitro DM digestibility (DMD) and in situ starch degradation characteristics. Six maize genotypes were chosen for the study: DK9108 from Monsanto, P30Y87, P3939 from Pioneer, QPM-300 (quality protein maize) and W94 from the International Maize and Wheat Improvement Center (CIMMYT), and a local cultivar, Afgoii, from the Cereal Research Institute (Persabaq, KP). A total of 72 plots (8 m x 10 m) were blocked in three replicate fields, and within each field, each genotype was sown in four replicate plots according to a randomized complete block design. For the data analysis, the Proc-Mixed procedure of Statistical Analysis System with repeated measure analysis of variance was used. The DM yield was strongly influenced (P < 0.001) by maize genotypes, varying from 12.6 to 17.0 tons/ha. Except for total CHO and ammonia nitrogen (NH3-N), the contents of all measured chemical components varied (P < 0.001) among the genotypes. Further comparison revealed that, genotype P3939 had a higher (P < 0.05) content of CP (7.27 vs. 6.92%), starch (36.7 vs. 27.9%), DMD (65.4 vs. 60.0%), ME (2.51 vs. 2.30 Mcal/kg) and lactic acid (5.32 vs. 4.83%) and lowest content of NDF (37.3 vs. 43.1%), pH (3.7 vs. 4.10) compared to the local cultivar (Afgoii). Advancement of post-flowering maturity from 25 to 35% DM (23 to 41 days after flowering (DAF)) increased (P < 0.05) the DM yield (10.4 to 17.8 tons/ha), starch content (29.1 to 35.0%), DMD (65.3 to 67.3%) and ME (2.34 to 2.47 Mcal/kg), and decreased (P < 0.001) the contents of CP (7.42-6.73%), NDF (48.8-38.5%), pH (4.10 to 3.60), NH3-N (8.93-7.80%N) and effective degradability of starch (95.4 to 89.4). Results showed that for higher yields and silage nutritional and fermentation quality, maize crops should be harvested at whole crop DM content of 30-35% (34 to 41 DAF). It was further concluded that genotype P3939 is the most suitable summer maize genotype for silage production in terms of yields and silage nutritional and fermentation quality under the hot environmental conditions of the tropics.